Stylish Smilies adds CSS classes to text-based emoticons. 
You can then reference these classes in your theme to style each emoticon differently:
<pre><code>.smiley {
/* Applies to all emoticons */
 color: black;
 font-weight: bold;
}

.biggrin {
/* Applies to :D only */
 background: green;
}
</code></pre>
This plugin affects the following smilies:
<pre><code>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
</code></pre>

Stylish Smilies

Stylish Smilies adds CSS classes to text-based emoticons.

Saurin Dashadia

Symatic Solutions

This plugin converts images to their ASCII representation. This plugin is useful to convert images for websites those do not support adding of image as part of user content. You can always convert image and paste the result in user content area to show image using ASCII codes.
Find out more at https://github.com/SymaticSolutions/PicsAscii
Follow us on Twitter: @symaticsolution

PicsAscii

A Simple WordPress Plugin to Convert Image to ASCII Representation.

Stylish Smilies vs PicsAscii