For Chemistry geeks who play Backgammon (an admittedly small demographic, I know): a Doubling Cube that has been obfuscated by using Periodic Table Elements instead of numbers:

2 - He

4 - Be

8 - O

16 - S

32 - Ge

64 - Gd

This is a solid version. A hollowed out version (suitable for cheaper printing in metal) is available here: Hollow Elemental Doubling Cube