I bought this gorgeous butter London polish while I was in New York last month. It's called 'Fishwife'. Not the most attractive name, but the shade is a real grower.
It's holographic, so naturally I was instantly attracted to it anyway, but the shade of pale seafoam green is really unusual anyway, and mixed with a hint of holo, I think it makes it a really interesting colour, and perfect for spring, but not your a-typical mint green...
This kind of shade is the reason I love butter London polishes. The brand really makes an effort to be unique and create original shades.
I picked this up in Henry Bendel (possibly my favourite shop in the world!) but you can pick them up from the Butter London Website, and some larger Boots stores in the UK, for £10 ($15 in the US)