L.A. Girl has a line out of nail polish called Glitter Addict.
Glitter Addict polishes come in 16 different colors and contain various shapes and sizes of glitter. The ones I tried were large hexagonal, small round and micro-glitter pieces.
These come in a clear base, so ideally layering them over another color is probably the best look. I swatched them on their own so you can see how jam packed with glitter they actually are.