Putting two additional quotes to the reply form
When you hover two additional buttons pop-up with variants of styling.
http://s4.uploads.ru/yb63V.jpg

Author: Deff
Platform: MyBB

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

Code:
    <style type="text/css">
    .post-content .book,.post-content .yumor{
      color: #000000;
      border-radius: 0 25px 0 25px;
      padding:0 1em 1em 1em; margin-bottom:1em;
      background: #EDD9A2 url("http://savepic.su/5665223.png") no-repeat 0 50%;
      background: -moz-linear-gradient(0deg,#EDD9A6, #FDB90F);
      background: -webkit-linear-gradient(0deg,#EDD9A6, #FDB90F);
      background: -o-linear-gradient(0deg,#EDD9A6, #FDB90F);
    }
    .post-content .book>blockquote {
      padding:18px 0;
      padding-left:80px;
      background: url("http://savepic.su/5661138m.png") no-repeat -15px 50%;
    }
    .post-content .yumor>blockquote{
      padding:25px 0;
      padding-left:110px;
      background: url("http://savepic.su/5665223.png") no-repeat -15px 50%;
    }
    .post-content .book>blockquote p{
      font: italic normal 400 20px/21.6px Georgia;
      color: #000000;
    }
    .post-content .yumor>blockquote p{
      font: italic normal 400 20px/21.6px "Comic Sans MS";
      color: #000000;
    }
    .post-content .book > cite,.post-content .yumor > cite{
      display:block;
      margin:0 -1em 0 -1em; border-bottom:#3F73DC 1px dashed;
      font: italic normal 700 15px/21.6px Georgia;
      padding:7px 12px;
    }
    .post-content .book{
      background: #EDD9A2 url("http://savepic.su/5661138m.png") no-repeat 0 50%;
      background: -moz-linear-gradient(0deg,#EDD9A6, #F8F8F6);
      background: -webkit-linear-gradient(0deg,#EDD9A6, #F8F8F6);
      background: -o-linear-gradient(0deg,#EDD9A6, #F8F8F6);
      font: italic normal 400 17px/normal Georgia;
    }
    #add_Quotes {
      position:absolute;
      width:24px!important;
      left:50%;margin-left:-12px;
      top:0;
    }
    #button-quote>center{
      opacity:0;
      visibility:hidden;
      transition-duration: 1.9s;
    }
    #button-quote:hover>center{
      transition-duration: 1.9s;
      opacity:1;
      visibility:visible;
    }
    .punbb #add_Quotes tr{
      padding:0!important;
      max-height:22px!important;
    }
    #add_Quotes td{
      height:10px!important;
      padding:0!important;
      width:22px!important;
    }
    #add_Quotes td[title="Quotation from the book"]{
      background: url("http://savepic.ru/7069041.png")  no-repeat 50% 3px;
      background-size:auto 23px;
    }
    #add_Quotes td[title="Time for positive"]{
      background: url("http://savepic.su/5665223.png") no-repeat 50%;
      background-size:cover;
    }
    </style>
    <script>
    var a = 'Quotation from the book wrote:';
    $('.post-content div[class="quote-box"]>cite:contains("'+a+'")').text('Quotation from the book:').parent('div').addClass('book').removeClass('quote-box');
    var a = 'Time for positive wrote:';
    $('.post-content div[class="quote-box"]>cite:contains("'+a+'")').text('Time for positive').parent('div').addClass('yumor').removeClass('quote-box');
    var a ='<center style="position:relative;"><table id=add_Quotes><tr><td id="button-book" title="Quotation from the book">@@</td></tr><tr><td id="button-yumor" title="Time for positive">##</td></tr></table></center>',b3="]'";
    var b1 = '<img onclick="bbcode(\'[quote=Quotation from the book:'+b3+',\'[/quote'+b3+')" src="/i/blank.gif"/>',b2 = '<img onclick="bbcode(\'[quote=Время позитива'+b3+',\'[/quote'+b3+')" src="/i/blank.gif"/>';
    a = a.replace('@@',b1).replace('##',b2);
    $('#post #button-quote').append(a);
    </script>

Additional icons of quotation appear when hover over the icon of current quote in the reply form
* ATTENTION! You can use your own styling and images for buttons.