When I first bought some epoxy resin, I didn't want to ruin a bunch of nice bezel settings while I got past the learning curve (resin is kiiiinda finicky.) So I cut apart some circuit boards and set them in old bottle caps for a test run with the resin. And liked them so much I did a bunch more. A few of my friends have gotten in the habit of giving me any bottle cap they think I might not already have.
Now that the fuss and panic of the Comic-Con Art Show is three weeks in my rear-view mirror, I think it's time to make another batch..
Recycled bottle caps, recycled circuit boards, epoxy resin, ball chain, split rings.