"Black Shatter" nail polish by Katy Perry for O.P.I. is pretty much the sh!t. It's fun to use (though it takes a bit of practice to get the feel for it) and looks edgy and fun. I tried it earlier this week on top of yellow and right now I'm wearing it on top of pink. I do wish it were available in more colors though. So far the only color besides black I've seen is silver.