Ghost of a Flea pointed to this, which is kind of neat. It's an online Etch-a-Sketch.
It reminded me of a guy I read about maybe a year ago. He does quite elaborate pictures on the Etch-a-Sketch and sells them for up to $8000. (When he completes one, he removes the back and sprays the screen with a fixative, making it permanent.) Here's one:
His site is here. I don't know if it qualifies as "art," but it's certainly an impressive display of draftsmanship to draw a picture with a single unbroken line.
The first site, btw, is running a contest (with some presumably-worthless "points" as a prize) to see who can draw the best picture. Don't worry that you're not good enough to enter, though. Most of the competition is more like this:
