It seems like the most reproduced thing has been the WHISTLE, simple, loads of fun, can be printed with the bead inside. How about a mate for that musical instrument... the MINI MARACA, or for my purposes, a BABY RATTLE!
This baby rattle has a sacred geometry acoustic opening with three "crystal" shaker beads printed right inside.
The hexagram fractal is the sacred structure of our universe, from the sub-micro to the super-macro, all religious symbology aside, these basic and universal geometric patterns are what I want my child to experience with his first interactive playthings.... made open source and with love, hopefully on a makerbot.
OPEN SOURCE, make it better, please.