I just came across this story on digg about an etch-a-sketch artist. At first I was like “how good could it be?” until I actually got to the site.
The first one I saw was an image of Bioshock which was better than a lot of people could do with paper and pencil. I think extra kudos should be given to him just for doing it on the tiny travel etch-a-sketch.
My fav so far is The Puzzler just for the nifty background in it. Second is scene from Star Wars.