IDK -China Glaze

I like China Glaze. They have a very diverse collection of colors. The quality isn't as good as OPI, but therefore it's not as expensive.

This is a holographic nail-polish. 

When light hits the polish at a certain angle you can see an amazing holo effect. Also, I like the metallic glow and the way the light purple shimmers even without light. :)

shadow:

light: