DIY Fried Marbles. OK, I never heard about these, but lots of people have. From Craftster Contributor allyinthevalley. Tutorial here. So cool, you could wrap them with wire for jewelry, or just look at them in a bowl. Much more on site but she writes:
Put your clear marbles (It’s useless to use solid colored ones. You can’t see the cracks on the inside.) in a pie pan. Bake them in a preheated 500 degree (farenheit) oven for about 20 minutes. There’s no need to go over 20 minutes, though it doesn’t hurt them. I tried different times and any left in for over 20 minutes all look the same. Have a metal bowl with ice cold water ready. Remove your marbles and immediately dump them into the water. The marbles crack, you ooo and ahh, and you’re done!