I've spent a bit of time porting Sean O'Neils demo code from his Gamasutra article over to os x / GLUT. I haven't made any attempts at prettying it up, so it may not read very well. Anyways read the articles, be inspired, run the demo and see what you can make out of the algorithms.

Source article:
http://www.gamasutra.com/features/20010302/oneil_01.htm

Followup articles (I haven't ported this code yet..):
http://www.gamasutra.com/features/20010810/oneil_01.htm
http://www.gamasutra.com/features/20020712/oneil_01.htm
http://www.gamedev.net/reference/article...le2093.asp

And the ported source:
http://sculpt.x-wing.ca/GLDemo.tgz

This looks marvelous... I'd like to see more.