While this is pretty cool, it's been done before in a much better way:

http://www.abrahamjoffe.com.au/ben/canvascape/

Making shapes in CSS is almost definitely the wrong way to go, especially when canvas is available in Firefox, Opera, and Safari. Throw in Google's VML translator, and you get Internet Explorer support too.

Nice to see someone attempt it, just to see if it can be done. But all trends seem to indicate that canvas tags will become regulars in browsers, as well as faster javascript engines...