You know I would love these rings by Regina Schuetz Silberfluss
Jonathan Ben-Tovim's " Encoder Rings began as an investigation in how to store precious or personal digital information. The result is a series of rings that are decorated with tiny blobs and holes, that actually represent letters in binary code; the code used as the basis for digital information. The user would choose a secret message 64 characters long, have the message translated into binary code and finally have a ring produced using rapid-prototyping." Seen below.
All via Carrotbox.