
glad you like it.
For an even more special ball, make them on a moon phase. Full Moon Balls...LoL that just sounds ummm, loaded, Bwahahahahahah...oooops
By the way, there aren't many stones that you cannot use, ie; toxic, like cinnabar. Even fluorite is ok to use. Some stones might break down a bit if exposed to moisture like selenite, but for the most part I use clear or smoky quartz, rose quartz, amethyst, fluorite and a variety of tumbles stones usually agate of some sort.
and like Ed said Ouch...no super sharp shards!! tumbled obsidian would be fine.
BB, FF