Check this out...I made these fabulous pendants out of floral marbles.
I baked my marbles for 20 min on 350 degrees in my toaster oven. Immediately after taking them from the oven I dumped the hot marbles in ice cold water. The change in temp causes all these cool cracks to form. Science is AWESOME. I put a bead end cap and a ring on the top of each cooled marble to create a pendant.