Stretching the boundaries of the “math” category, I’d like to point you to Bathsheba Grossman: an artist who makes stunning sculptures based on (amongst other things) mathematical operations.

The Vorocube – a tangible Voronoi network.
Should you find the time to browse her site, you’ll also find quite interesting 3D laser etchings in glass. And no, it’s not the tacky stuff you can buy at the mall – it’s really worth a look.
[Edit - fixed spelling]
you suck. this is stupid. i am better
I was tempted to delete this comment, since it really adds nothing of value… But then again, it nicely demonstrates the IQ bar on the Internet.
Also, note for the commenter: You really shouldn’t be using school computers for this. It makes tracing you rather easy. And if you get somebody actually upset, I’m sure the school will be happy to have a talk with you. I know Sioux Falls, SD is not the most exciting place on earth, but I’m sure there are better things to do than random drive-by spamming…