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.

cyclonecode

This plugin creates text based images for uploaded attachments.
<h3>Support</h3>
If you run into any trouble, don’t hesitate to add a new topic under the support section: 
<a href="https://wordpress.org/support/plugin/asciify" rel="ugc">https://wordpress.org/support/plugin/asciify</a>

Asciify

This plugin creates text based images for uploaded attachments.

Stylish Smilies vs Asciify