I thought it would be fun to do a basic Pinball ring. The design started off as a 1 1/16 round ball with a hole bored through it and offset so the bulk of the ring is on the topside.
Could be a cool Pinball Club Championship Ring, Wedding Ring for the die hard pinhead or just for casual wear.
Would advise if you are tempted just get a cheap white plastic to test fit and if you like it then get a metal one. Prices range from $5 through to almost $4000 for platinum, with all prices based on their material costs. I reckon the gold plated brass is pretty good.
I will add some more sizes in the next few days though prices will rise with the hole getting smaller due to the amount of material increasing.
http://www.shapeways.com/model/2768977/pinball-ring-size-13-22-2mm-id.html?materialId=83