I found this awesome site called http://www.myoats.com/ and i thought I'd share

You can basically draw these really cool symmetrical shapes. There are very few tools and you can only use two colours: background and foreground, and the only way to erase stuff is via undo. There isn't an eraser tool. But these limitations actually put you in a different mindset while making your drawings and sort of free you up to try new stuff and I dunno just experiement with the tools you do have, which are basically varying line widths and opacities, and some basic shape tools. Some of the stuff people have made on the website is fking aweomse

It's very cool so check it out if you like drawing or doodling!

http://www.myoats.com/account/comments .aspx?p=0&wd=59960