I'm on an iPod ATM so I won't requote everyone above me but I'll explain.
I'm still configuring the colors and such but basically what it is is W7 Ultimate running bblean which is an alternative shell to W7. In the bottom left I have foobar running a theme I found on deviantArt, above that is FireFox running a Stylish plugin theme that was made by the same guy who made the current W7 theme I'm running. Then Steam is running another theme as well.