Here's another graphite mold for shaping beads. It's sort of a stacked cyclinder - but here's a hint - you don't have to use the entire length of the mold cavity!
I actually found this one to be very easy to use - easier than most of the others I've tried. I started with a cylinder - shaped it, and then added a "spare tire" in the middle, and used the mold to refine the shape.
I think it would look cool done in bright, primary colours - opaques - oranges and greens and yellows and reds and blues. Bright, playful colours. Maybe with some spots or bumps added too. Fun beads!