Some people out there might remember Floam, a toy that's advertised as a "molding compound" that could be used to decorate just about anything.
A while ago, Nail-Venturous released a Floam polish, and it is flippin FANTASTIC.
Look at that. Just look at all its awesome glory! The colours are fantastic - bright neon yellow and blue, mingling together to look green from afar, but close up? Oh man...
This is three coats of Floam covered with one coat of Gelous and Seche Vite. I could have gotten away with two, but I wanted to make sure I had full coverage.
Application isn't the easiest, it can be a bit goopy and tricky to get even, but it's worth the minor quibbles. You will need a glitter tamer of some sort for a smooth finish, what I used above worked perfectly.
Floam is available from ninjapolish.com - track the restocks on this one, it flies off the shelves fast.
Side note: this is messy as heck to remove. It comes off easily, but that tiny glitter lingers for days. Oye!