baked marbles - Bake on a cookie sheet at about 325 - 350 for 20 minutes. Remove from oven & immediately put them in a metal bowl or sink of cold water & ice - they'll sizzle & crack. Can be wire-wrapped, or glue end caps with rings on the marbles
Bake marbles at degrees for 20 minutes (for more cracking-look, bake at 500 degrees for 30 minutes). Remove and carefully drop into pan of ice water. Glue end caps to finished marble (w/starter rings) to create bracelets, earrings, pendants, ornaments
Fried Marbles - we used to make these when we were kids. They're especially pretty with cat's ete marbles. Bake marbles at 350 F for 20 min, drop them into ice bath, and watch them crack into a pretty pattern.
Cracked glass stones tutorial - most popular dollar store craft tutorial of Preheat oven to 425 degrees. Bake stones for 20 minutes. Then dump stones into bucket of ice water & they'll immediately crack.
How-to Sea ~ Glass Earrings Martha Stewart ~ Drilling holes in sea glass. Use Silly Putty to anchor the glass in, that way you dont slip and drill your finger. Also you will feel the glass "give" into the putty & know that you are all the way through!