Bm themes are Black Minimalist themes which aim to "flush away" all the extra crap that clogs up your screen and provide a nice truly dark theme.

Based on the style by Kaligula, I've decided to make it my own project to keep it up to date and nice as it is currently not being updated by its author. (or at least it wasn't for over a year at the time I made this) Any credit/thanks should go to them for making it in the first place, I've only made minor tweaks and updates.
http://freestyler.ws/style/61924/facebook-black-dark