Where i work at we design decals for Chrysler and GM on alot of the aftermarket vehicles. So I talked with the person that does them, and he said he'd most likely be able to cut them out.
The material they use is made to withstand the elements, i can't remember the name, but 3M is what is usually used, and the stuff that i'll be using is alot better.
i'm thinking of just going total silver, but have sort of like a boarder cut out around the outside, so the blue from the car would show through, so i would be silver, then blue from the car, then a small silver boarder.
Might not look to bad that way.