craftgrrl | glass marbles????

I have a TON of those flat clear glass marble (about 1 inch) that you make the marble magnets out of. I only use the really good ones to make necklaces out of (I put pictures behind them) the ones with flaws in them however I have no real use for, I was trying to think of something I could cover them with or paint them with so that they can be made into necklaces as well. But I can’t seem to think of a thing! Can you great crafty people come up with something I can do with them (besides putting them in a vase and setting them around)?Thanks