MoreMeYou

This is a beautiful little drawing activity. More your cursor and watch the swirling colourful lines develop.

http://www.moremeyou.com/you.html

ArtPad

This is very cool in so many ways. I love the fact that you can replay the drawing. This would be an excellent way to illustrate a technique or show someone how to draw a specific object. But equally so it is just a great way to show off your drawing skills.

http://artpad.art.com/artpad/painter/

Flame Painter

Paint with flames. This would perfect for backgrounds or graphics, however it is just good fun no matter how you use it.

http://www.escapemotions.com/experiments/flame/index.html#top