Well, I have just the solution for you! I've started a forum avatar gallery for anyone to use if they want. What you do to add one of these cool avatars to your profile is click on "User Control Panel" at the top of the forum, then click on "Profile", then on "Edit Avatar", then on "Display gallery" and select the avatar of your choice. I've created a couple of categories of avatars so far (story and spells), but plenty more are to come! Enjoy!
Oh, and you can always create your own and upload it, if you want (150x150 pixels). Just keep it clean, please!