For the last of my vacation manis, I wore OPI Simmer & Shimmer (Burlesque, Holiday 2010), a primarily sky blue and gold multicolored glitter in a clear base.  I layered it over Illamasqua Boosh:

Picture taken in sunlight.  I used one coat of black and one coat of glitter.  While the main colors of glitter are blue and gold, when I look closely I can also spot silver, orange, pink and green glitter.  This is a very sweet-looking blue, and layering it over black gives it a very magical, cosmic look.  It definitely reinforces my love of layering over black. 🙂  I paired this with Wet n Wild Lust (Craze) on my toes.