I know it's been said before in the past that people have had their lampworker friends put some of their pet's ashes into hot glass, then making a lampworked bead. I always thought that was a really cool idea because I saw one of the beads (I think it was one of Marilee's) and it was very beautiful - it just glowed.
Anyway, I happened to run across the website of Glitzy Glass Studio (she has really COOL glass toggles, too). They encase a small amount of your pet's ashes into a boro glass bead that has a bubble on the top of it. You choose the colors offered and get to pre-approve the boro bead prior to the ashes being encased into the bubble; then the finished bead comes to you with a 16-18 in. sterling snake chain. $40.00 total... AND for every purchase, a contribution is made to their local no-kill pet rescue.