Back in 2007, I got Photoshop, and I immediately started playing with it to create Harry Potter graphics - mostly avatars, but also a few story banners. I stopped for the most part in 2008, but there are a few gems hidden in there. Feel free to use them as your avatar or whatever - just please credit hpboy13.
Trio Avatars Neville and Luna Avatars Snape and Draco Avatars Bellatrix Avatars Miscellaneous HP Avatars
Non-HP Graphics (mostly Kim Possible stuff)