I recently participated in the Steampunk charm swap on Craftster.
I made charms for six partners in our group, The Coopered Lushingtons. The bottlecap charms are painted with oxidizing metallic paint and filled with resin and watch parts. The blue teardrop and the amber oval piece are resin colored with transparent pigments, and the two opaque gold teardrops are resin mixed with gold mica powder. It was my first time working with resin; it was fun and fairly easy to work with and I love the results. I'll definitely be using it again.
See all the swappers' creations at the Steampunk charm swap gallery, here.