FanArt with a Flourish
Getting Arty
FanArt rules! A friend of mine drew that ^. It's pretty sweet.
This is one of my very favourite fanart sites. There is particular attention paid to the Death Eaters, especially the Malfoys. Besides illustrating things from the books, she draws a lot of silly things as well. Her little comics are pretty hilarious.
Pottery Art:
This site is full of fun art. The artist has illustrated basically all of Prisoner of Azkaban in her Disney-esque style.