Anything associated with rap legend Dr. Dre is bound to be cool by default, but he's really excelled himself with the headphones that bear his name. They've been around for a while now - and they're close to being the industry standard when it comes to quality - but that iconic logo looks as fresh today as it did on the day it was unveiled.
The key to this one is simplicity. What looks like a simple case of putting a 'b' inside a red circle is actually something far more detailed. Imagine the 'b' as one side of a pair of headphones, and the big red circle as a human head. Now look at it again, and you'll see it as someone wearing white headphones. That's exactly how it was designed, and now you know it's there you'll never see it any other way.