Oh, this is incredible. I signed up for Stumbleupon and the very first site I see after I installed the toolbar almost had me gasping. This is fabulous and you've really got to visit www.jacksonpollock.org
There is nothing to read. You just begin pulling your cursor all over the screen and it drops a line of ink. When you click the mouse the ink changes color. When you pause it blobs. As you streak across the screen little flips of ink splatter about...just like a Jackson Pollock painting. What therapy. What a kick.
Here is the painting I did. This is really neat!