SketchUp + Escher = Skescher?
Here's my October project for the Math Forum: creating Escher tiles based on a square. This project appeals to math students, but also kids in art or graphic design classes. I let my own kids loose with this project, and they had a blast (though the model below was made by yours truly).
Escher was a genius - not only does his work teach concepts like tessellation, but also requires that you use your imagination to come up with animals or strange-looking people or monsters. What kid (or adult) wouldn't find that fun? And what better application to create these tiles than SketchUp?
Anyone can design anything in 3D! www.3dvinci.net