I just ordered some of that trimbrite blackout tape for my window trim
We'll see how it goes. If it doesn't come out looking good then I'll just drop my car off at a shop like Dark Knight suggested.
I'm sure they are removable I think its probably more trouble than its worth though.
The stuff is pretty cheap so if it doesn't work out. No huge loss
http://www.amazon.com/Trimbrite-T900.../dp/B00029XD62