/n software offers a couple of PowerShell stickers - one for your car, one for you laptop. You need to fill in a form on their website and you will automatically be entered for a chance to win a new PowerShell Skinned XBox 360.
I already got mine. Unfortunately I had a car accident last Thursday (nothing serious) and my car is in repairs, so I can't show off my bumper here )-:
Get your own stickers here.