3D symmetry is fun and all, but it's hard to compare to the Mex Hexaflexagon. If you don't know what we're talking about, check out these posts...
If you don't know Vi Hart, check out this post:
Doodling in Math Class
For hexaflexagons read these:
Tex Mex Hexa Flex
Tasty Mex Hexaflexagons at Digital Diner
You wont be disappointed.