I need new Christmas Ornament Balls on my tree but the pretty glitter ones can get a little pricey. I thought, surely, someone has made these and went on a YouTube search. Sure enough, videos galore.
In a nutshell, you need mop & glow, clear ornaments, and fine glitter.
Place mop & glow in bottom of ornament and swirl to cover the inside (a few different techniques on YouTube) and let it drain out. Dump in about a table spoon of glitter, swirl around, and dump out excess....and there you have it.
I might make some with vinyl initials for gifts.