This is going to be a concise tutorial. On my another blog i had an old theme which doesn’t support displaying Avatars in comments. So i wandered along and found this snippet which can be replaced by the Avatar picutre when compiled and sent over to the server. So lets get it straight and show you the code
if (function_exists('get_avatar')) { echo get_avatar(get_comment_author_email(), '32'); }
The above code renders to a 32 x 32 image which is an avatar for the user who left comment on your blog post. Just put this snippet inside comments.php that is located inside wp-content/themes/theme-folder
Hope this helps to tweak one of your old theme. Any updates, feedback, leave a comment 
Cheers !!
Realin !
I actually think so too=] I have been searching around the internet for a while today, and its kinda hard to find anything interesting to read on blogs=P Maybe its because there are too many of them around =) But your website actually keeps catching my attention=] Great posts, and cool design ^__^. Ill be sure to give it more time now =)
+1 for creativity