Extended color palette
http://s7.uploads.ru/FoPT5.jpg

Author: Romych
Platform: MyBB
Analogues: Additional colors in standard window (MyBB) [Romych]

1. very short code
2. almost unlimited palette

demo

http://sh.uploads.ru/1NX0e.gif

To HTML-bottom (Admin → Options: 2nd form):

Code:
    <!-- Extended color palette (NEW) -->
    <script type="text/javascript">
    $('#color-area tr').append('<td><input type="color" id="litr" style="cursor:pointer;padding:0;width:22px;" title="Show the whole palette" value="#ffa500"></td>');$('#litr').change(function(){bbcode('[color='+this.value+']','[/color]');});
    </script>

To change styling you can add next code before the script:
http://sg.uploads.ru/QDz3a.jpg

Code:
    <style type="text/css">
    input[type=color]::-webkit-color-swatch {background-color: transparent !important; border:none;}
    input[type=color]::-moz-color-swatch {background-color: transparent !important; border:none;}
    #litr{background: url(http://data.colorzilla.com/images/logo.png) no-repeat scroll 0 0 / cover ;}
    </style>

Color palette to the reply form
http://support.liveforums.ru/uploads/0002/be/6c/4466-1-f.jpg

Author: Russian_Goblin
Platform: MyBB

Adds 4096 colors to the standard palette.
To HTML-bottom (Admin → Options: 2nd form):

Code:
<script type="text/javascript"> 
//
// Author of the script: RUSSIAN_GOBLIN (с) 2011/08/06
// P.S.: It's better to create forums here: http://LiveForums.ru/
//
if ((document.URL.indexOf('viewtopic.php?')!=-1)
||(document.URL.indexOf('edit.php')!=-1)
||(document.URL.indexOf('post.php')!=-1)
||(document.URL.indexOf('messages.php')!=-1))
{

var ColorsBank = new Array ('00', '11', '22', '33', '44', '55', '66', '77', '88', '99', 'aa', 'bb', 'cc', 'dd', 'ee', 'ff');
var i=0;
var table='';
var ColorArray = new Array();

for(r=15;r>=0;r--){
for(g=0;g<=15;g++){
for(b=0;b<=15;b++){
ColorArray[i]=ColorsBank[r]+''+ColorsBank[g]+''+ColorsBank[b];
table=table+'<p style="width:1px; height:1px; float:left; background:#'+ColorArray[i]+'"><img src="/i/blank.gif" alt="#'+ColorArray[i]+'"/></p>';
i++;
}}}

tablecolors='Color: <input id="now_color_rgb" name="now_color_rgb" type="text" size="7" value=""> Code: <input id="now_color" name="now_color" type="text" size="7" value="#rrggbb"><table  cellspacing="0" cellpadding="0"><tr><td id="table_new_colors">'+table+'</td></tr></table>';
//alert(tablecolors);
$('div#color-area').prepend(tablecolors);

$('#table_new_colors p img').mouseover(function (){
var clr=$(this).attr("alt");
$("#now_color_rgb").css('background',clr);
$("#now_color").val(clr);});

$("#table_new_colors p img").click(function (){
var clr=$(this).attr("alt");
$("#now_color_rgb").css('background',clr);
$("#now_color").val(clr);
clr='[color='+clr;clr+="]";
bbcode(clr,"[/color]");});
}
</script>

New palette © Deff
Author: Deff
Platform: MyBB
Demo:

To HTML-bottom (Admin → Options: 2nd form):

Code:
        <style>      /* New palette © Deff */
        #color-area{
        background:url(http://savepic.net/675564.gif) 50% 0 no-repeat;
        }
        table.Myp,table.Myp td,
        #len-tbl-01,#len-tbl-01 td{
        text-align:left;
        vertical-align:top;
        padding:0!important;
        margin:0!important;
        border-collapse:collapse!important;
        }
        span.hidds{
        display:block;
        width:18px;
        height:18px;
        background:url(http://savepic.net/707441.png) 50% 50% no-repeat;
        margin: 6px 21px -6px -21px;
        }
        #len-tbl-01{
        margin: 1px 21px 12px 0!important;
        width:100%;
        }
        #len-tbl-01 td {
        padding:0!important;
        width:11px!important;height:12px;
        background-image:url(http://savepic.net/711220.gif);
        background-position:50% 50%;
        background-repeat: no-repeat;
        background-image: none;
        border: #fff 1px solid!important;
        }
        #len-tbl-01 td:hover {
        background-image:url(http://savepic.net/686931.gif)!important;
        background-position:50% 50%;
        background-repeat:no-repeat;
        }
        table.Myp{
        width:280px!important;
        }
        table.Myp td,table.Myp tr{
        height:18px!important;
        vertical-align:text-bottom;
        margin:0!important;
        border: none 0 transparent!important;
        border-collapse:collapse!important;
        }
        td.rightMy,td.murom {
        text-align:left!important;
        width:66px!important;
        }
        #name_1,#name_0{
        margin:0;
        posizion:absolute; z-index:2000;
        font-size:11px!important;
        background-color:#fff!important;
        border: #000 1px solid;
        width:58px!important;
        }
        #name_1{
        border: red 1px solid!important;
        font-size:11px;
        color:#761A21;
        }
        #name_0 {
        font-size:11px;
        color:#000!important;
        }
        #len-tbl-01 img {
        position:absolute!important;
        border: #000 1px none;
        }
        #len-tbl-01 img.Nul_Img  {
        position:absolute!important;
        height:11px!important;
        width:11px!important;
        margin:0!important;
        }
        #len-tbl-01 .metka {
        position:absolute!important;
        z-index:100;
        margin:-1px 0 0 -1px!important;
        height:13px;
        width:13px;
        }
        </style>
        <script type="text/javascript">
        if ((document.URL.indexOf("viewtopic.php?")!=-1)||(document.URL.indexOf("edit.php")!=-1)
        ||(document.URL.indexOf("post.php")!=-1)){
        ColorArray=new Array(
        "EEEEEE","DDDDDD","CCCCCC","BBBBBB","AAAAAA","999999","888888","777777","666666","555555",
        "444444","333333","222222","111111","000000","FC0000","ED0000","DB0000","CB0000","BA0000",
        "AA0000","980000","880000", //2line-->
        "FEFD65","FEFD33","FCFC00","CAFEFE","CAFECA","CBFE99","CAFE65","CBFE33","CAFC00","99FEFE",
        "99FECA","99FE99","98FE65","99FE33","98FC00","65FEFE","65FECA","65FE98","65FE65","66FE33",
        "65FC00","33FEFE","33FECB", //3line-->
        "FECA65","FECB33","FCCA00","CACAFE","CBCBCB","CACA98","CBCA66","CACA32","CBCA00","99CBFE",
        "98CACA","98CA98","99CB66","98CA32","99CB00","65CAFE","66CBCB","66CB98","66CB66","65CA32",
        "66CB00","33CBFE","32CACA", //4line-->
        "FE9865","FE9833","FC9800","CA99FE","CA98CA","CA9898","CB9866","CA9832","CB9900","9999FE",
        "9898CA","979797","989865","999833","989700","6598FE","6699CB","659898","659865","669933",
        "659800","3399FE","3298CA", //5line-->
        "FE6565","FE6533","FC6500","CA65FE","CB66CA","CB6698","CB6666","CA6532","CB6500","9865FE",
        "9866CB","986598","986565","996533","986500","6565FE","6666CB","656598","666666","656532",
        "666500","3366FE","3265CA", //6line-->
        "FE3365","FE3333","FC3200","CA33FE","CA32CA","CA3298","CA3265","CA3232","CB3200","9833FE",
        "9832CA","993398","993365","993333","983200","6533FE","6532CA","653399","653265","653232",
        "663200","3333FE","3232CA", //7line-->
        "FC0065","FC0032","FC0000","CA00FC","CB00CA","CB0098","CB0065","CB0032","CB0000","9800FC",
        "9800CB","980097","980065","980032","980000","6500FC","6500CB","650098","660065","660032",
        "660000","3200FC","3200CB", //8line-->
        "00FC00","00ED00","00DB00","00CB00","00BA00","00AA00","009800","008800","007600","006600",
        "005400","004400","003200","002200","001000","0000FC","0000ED","0000DB","0000CB","0000BA",
        "0000AA","000098","000088" )//End

        var Metka_link="http://savepic.net/696986.gif";
        var Nul_Img_link="http://savepic.net/711220.gif";
        var stat_marker_link="http://savepic.net/668540.png";
        var nul_img='<img class="Nul_Img" src="'+Nul_Img_link+'" alt="s" />';
        var metka='<img class="metka" src="'+Metka_link+'"/>'; //alert(metka)

        var i=0,j=0,tbl="";var tblz="";
        var Ntd=23,Nstr=8;
        var TDstrStart='<td style="background-color:#';
        var TDstrEnd='">'+nul_img;

        for(j=0; j<Nstr; j++){tbl='<tr>'+tbl;
           for (i=0; i<Ntd; i++){NumTd=Ntd*j+i;tbl+=TDstrStart+ColorArray[NumTd]+';" alt="#'+ColorArray[NumTd]+TDstrEnd+'</td>'};
        tbl+="</tr>";tblz+=tbl;tbl="";};tbl='<table id="len-tbl-01"'+tblz+'</table>';//alert(tbl)
        $("#color-area").prepend(tbl);

        $("#color-area").removeAttr("onclick")
        $("#len-tbl-01").before('<table class="Myp"><tr><td class=murom><input id="name_1" name="_1" type="text" size="7" value="######"></td><td></td><td class="rightMy"><input id="name_0" name="_0" type="text" size="7" value="######"></td></tr></table>');$("#color-area").append('<span title="hide" class=hidds alt=hidds></span>')

        $("#len-tbl-01 td").mouseover(function(){
          $("#name_1").css({"color":"#000"});
            $("#name_1").val($(this).attr("alt"));
        });

        $("#len-tbl-01 td").click(function (){ // click the cell - enter bb-code and..
           $("#len-tbl-01 .metka").remove();$(this).append(metka);
            $(this).css({"background-image":"url("+stat_marker_link+")"});
               var ss=$(this).attr("alt");$("#name_0").val(ss);ss='[color='+ss;ss+="]";
                bbcode(ss,"[/color]");});

        $("#main-reply,.hidds").click(function (){ // hiding #color-area after clicking text area
        $("#color-area").hide(); });
        }
        </script>

New palette v2 © Deff
http://gerda.moy.su/_bd/0/55911963.jpg

Author: Deff
Platform: MyBB
To HTML-bottom (Admin → Options: 2nd form):

Code:
<style> /* New palette v2 © Deff */
  #color-area{
  background:url(http://savepic.net/844049.gif) 50% 0 no-repeat;
  }
  table.Myp,table.Myp td,
  #len-tbl-01,#len-tbl-01 td{
  text-align:left;
  vertical-align:top;
  padding:0!important;
  margin:0!important;
  border-collapse:collapse!important;
  }
  span.hidds{
  display:block;
  width:18px;
  height:18px;
  background:url(http://savepic.net/829713.png) 50% 50% no-repeat;
  margin: 6px 21px -6px -21px;
  }
  #len-tbl-01{
  margin: 1px 21px 12px 0!important;
  width:100%;
  }
  #len-tbl-01 td {
  padding:0!important;
  width:11px!important;height:12px;
  background-image:url(http://savepic.net/711220.gif);
  background-position:50% 50%;
  background-repeat: no-repeat;
  background-image: none;
  border: #fff 1px solid!important;
  }
  #len-tbl-01 td:hover {
  background-image:url(http://savepic.net/686931.gif)!important;
  background-position:50% 50%;
  background-repeat:no-repeat;
  }
  table.Myp{
  width:280px!important;
  }
  table.Myp td,table.Myp tr{
  height:18px!important;
  vertical-align:text-bottom;
  margin:0!important;
  border: none 0 transparent!important;
  border-collapse:collapse!important;
  }
  td.rightMy,td.murom {
  text-align:left!important;
  width:66px!important;
  }
  #name_1,#name_0{
  margin:0;
  posizion:absolute; z-index:2000;
  font-size:11px!important;
  background-color:#fff!important;
  border: #000 1px solid;
  width:58px!important;
  }
  #name_1{
  border: red 1px solid!important;
  font-size:11px;
  color:#761A21;
  }
  #name_0 {
  font-size:11px;
  color:#000!important;
  }
  #len-tbl-01 img {
  position:absolute!important;
  border: #000 1px none;
  }
  #len-tbl-01 img.Nul_Img {
  position:absolute!important;
  height:11px!important;
  width:11px!important;
  margin:0!important;
  }
  #len-tbl-01 .metka {
  position:absolute!important;
  z-index:100;
  margin:-1px 0 0 -1px!important;
  height:13px;
  width:13px;
  }
  </style>
  <script type="text/javascript">
  if ((document.URL.indexOf("viewtopic.php?")!=-1)||(document.URL.indexOf("edit.php")!=-1)
  ||(document.URL.indexOf("post.php")!=-1)){
  ColorArray=new Array(
  "EEEEEE","DDDDDD","CCCCCC","BBBBBB","AAAAAA","999999","888888","777777","666666","555555",
  "444444","333333","222222","111111","000000","FC0000","ED0000","DB0000","CB0000","BA0000",
  "AA0000","980000","880000", //2line-->
  "FEFD65","FEFD33","FCFC00","CAFEFE","CAFECA","CBFE99","CAFE65","CBFE33","CAFC00","99FEFE",
  "99FECA","99FE99","98FE65","99FE33","98FC00","65FEFE","65FECA","65FE98","65FE65","66FE33",
  "65FC00","33FEFE","33FECB", //3line-->
  "FECA65","FECB33","FCCA00","CACAFE","CBCBCB","CACA98","CBCA66","CACA32","CBCA00","99CBFE",
  "98CACA","98CA98","99CB66","98CA32","99CB00","65CAFE","66CBCB","66CB98","66CB66","65CA32",
  "66CB00","33CBFE","32CACA", //4line-->
  "FE9865","FE9833","FC9800","CA99FE","CA98CA","CA9898","CB9866","CA9832","CB9900","9999FE",
  "9898CA","979797","989865","999833","989700","6598FE","6699CB","659898","659865","669933",
  "659800","3399FE","3298CA", //5ine-->
  "FE6565","FE6533","FC6500","CA65FE","CB66CA","CB6698","CB6666","CA6532","CB6500","9865FE",
  "9866CB","986598","986565","996533","986500","6565FE","6666CB","656598","666666","656532",
  "666500","3366FE","3265CA", //6line-->
  "FE3365","FE3333","FC3200","CA33FE","CA32CA","CA3298","CA3265","CA3232","CB3200","9833FE",
  "9832CA","993398","993365","993333","983200","6533FE","6532CA","653399","653265","653232",
  "663200","3333FE","3232CA", //7line-->
  "FC0065","FC0032","FC0000","CA00FC","CB00CA","CB0098","CB0065","CB0032","CB0000","9800FC",
  "9800CB","980097","980065","980032","980000","6500FC","6500CB","650098","660065","660032",
  "660000","3200FC","3200CB", //8line-->
  "00FC00","00ED00","00DB00","00CB00","00BA00","00AA00","009800","008800","007600","006600",
  "005400","004400","003200","002200","001000","0000FC","0000ED","0000DB","0000CB","0000BA",
  "0000AA","000098","000088" )//End

  var Metka_link="http://savepic.net/696986.gif";
  var Nul_Img_link="http://savepic.net/711220.gif";
  var stat_marker_link="http://savepic.net/668540.png";
  var nul_img='<img class="Nul_Img" src="'+Nul_Img_link+'" alt="s" />';
  var metka='<img class="metka" src="'+Metka_link+'"/>'; //alert(metka)

  var i=0,j=0,tbl="";var tblz="";
  var Ntd=23,Nstr=8;
  var TDstrStart='<td style="background-color:#';
  var TDstrEnd='">'+nul_img;

  for(j=0; j<Nstr; j++){tbl='<tr>'+tbl;
  for (i=0; i<Ntd; i++){NumTd=Ntd*j+i;tbl+=TDstrStart+ColorArray[NumTd]+';" alt="#'+ColorArray[NumTd]+TDstrEnd+'</td>'};
  tbl+="</tr>";tblz+=tbl;tbl="";};tbl='<table id="len-tbl-01"'+tblz+'</table>';//alert(tbl)
  $("#color-area").prepend(tbl);

  $("#color-area").removeAttr("onclick")
  $("#len-tbl-01").before('<table class="Myp"><tr><td class=murom><input id="name_1" name="_1" type="text" size="7" value="######"></td><td></td><td class="rightMy"><input id="name_0" name="_0" type="text" size="7" value="######"></td></tr></table>');$("#color-area").append('<span title="hide" class=hidds alt=hidds></span>')

  $("#len-tbl-01 td").mouseover(function(){
  $("#name_1").css({"color":"#000"});
  $("#name_1").val($(this).attr("alt"));
  });

  $("#len-tbl-01 td").click(function (){ // click the cell - enter bb-code and..
  $("#len-tbl-01 .metka").remove();$(this).append(metka);
  $(this).css({"background-image":"url("+stat_marker_link+")"});
  var ss=$(this).attr("alt");$("#name_0").val(ss);ss='[color='+ss;ss+="]";
  bbcode(ss,"[/color]");});

  $("#main-reply,.hidds").click(function (){ // hiding #color-area after clicking text area
  $("#color-area").hide(); });
  }
  </script>