Firstly, I found the glass marbels at joann in the floral section.
Second. I have 1/2" circle magnets on the back--perfect for the 1/2" round punch. Just punch where you want to put the magnet and poke it through to the back. They stay perfectly put.
Sonya
------------------------------ Cheers,
Sonya My Website
These are so cute! And the coordinating packaging is great. Did you use the crystal effects to adhere the stamped image to the marble? I have some clear dome stickers I might try this with!!