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Stylish Smilies adds CSS classes to text-based emoticons. You can then reference these classes in your theme to style each emoticon differently:

.smiley {
/* Applies to all emoticons */
  color: black;
  font-weight: bold;
}

.biggrin {
/* Applies to :D only */
  background: green;
}

This plugin affects the following smilies:

8-)  cool
 8O eek
8-O eek
 :( sad
:-( sad
 :) smile
:-) smile
:-? confused
 :D biggrin
:-D biggrin
 :P razz
:-P razz
 :o surprised
:-o surprised
 :x mad
:-x mad
 :| neutral
:-| neutral
 ;) wink
;-) wink