I know several sites that deal specifically with character/forum avatars. I will list them below. If anyone knows a different site that should be added to the list feel free to post it below as long as it is public domain and is not copyrighted.
Avatar Abyss
http://avatars.alphacoders.com/
Free Avatars
http://avatars.jurko.net/
Age of Games, Avatar Creator
http://www.ageofgames.net/en/fantasyavatar/fantasy-avatar.html
Drakonis Avatars
http://drakonis.org/index?/category/33-portraits
Avatars Box
http://www.avatarsbox.com/webgallery/category.php?cat=34
Planet Smiles
http://www.planetsmilies.com/avatars/
TipTopGlobe
http://www.tiptopglobe.com/free-forum-avatars
Avatar Abyss
http://avatars.alphacoders.com/
Free Avatars
http://avatars.jurko.net/
Age of Games, Avatar Creator
http://www.ageofgames.net/en/fantasyavatar/fantasy-avatar.html
Drakonis Avatars
http://drakonis.org/index?/category/33-portraits
Avatars Box
http://www.avatarsbox.com/webgallery/category.php?cat=34
Planet Smiles
http://www.planetsmilies.com/avatars/
TipTopGlobe
http://www.tiptopglobe.com/free-forum-avatars
