A procedural drawing html page... not sure about the math behind it, but it's amazing! I especially like the effects you get from the "shaded" brush. It's also great because you can use it with your iPHONE!!! no download needed, just use safari and play!
Here's a quick doodle I did with it... if you click to enlarge it you can see the mathy-webbyness of it all. Have fun with it and show me what you create with it!