Loot: 
Power Ties
OK, let's admit it. Wire ties do not have the inherent geek appeal of an illuminated keyboard, the pick-me-up of a case of Bawls, or even the cuteness of a Timmy PC Case badge. But, they will help you to tidy up that nest of wires in your PC case, thereby improving airflow, possibly preventing a catastrophic meltdown of your precious PC.
OK, so you could also use them to keep your PC's exterior cables nicely bound. As I have yet to come up with a natural disaster you can avert by using them externally, this is can only be of secondary importance, of course ;)
Wire Tie Straps
