I ordered a small thing of resin and hardener plus the spherical molds. Its cool cause the biggest one is 1" and they step down from there. They come with some little trinket things to make Keychains or whatever. There will definitely be a flat spot, but that's OK. Its not huge. I'm pondering on ways to suspend the marbles in the middle of the mold. I should have all the supplies by this weekend, so hopefully next week I'll have something to post. Wish me luck!