More to explore:
Resin Crafts: Working In Molds - Part One
Resin Obsession blog: Lots of tuts for resin jewelry and resin crafts
Check out info on resin casting. You have a mold, mix the resin with a catalyst. Whatever is in the mold gets embedded in plastic.
A quick overview: How to make a resin pendant - by Rings & Things
Resin Crafts: Working In Molds - Part Two