If you like the cartoon Southpark you can make your own avatar based on SouthPark Characters.
There are two popular sites for this. The official site and a fan made site. They both have their pros and cons so try em both. Both sites are free to use to create your avatar. You can save them to your desktop or get html codes for linking. I prefer saving to me computer and using imageshack for hosting the picture.
Official:
http://www.southparkstudios.com/avatarFan made: http://www.customsouthparks.com
I made this with the fan made avatar creator.
Uploaded with
ImageShack.us
