A better option might be to use LEDs. Last year we used some blue ones for decoration, and this year we're using red (combined with photo detectors as a functional part of the robot to detect the white stripe on the field). If you go back to the automotive section of Walmart, they have some LED lighting options. We're using the flexible, adhesive backed LED strips available there. They're designed to run off a car's 12V supply, which conveniently makes wiring them to the robot extremely easy. Plus the adhesive works really well, making mounting them a lot easier than anything else. And if that wasn't enough, you can even route them around corners because of the flexibility! Walmart usually has them in both blue and red.
As a bonus, you could run both the blue and red ones through a single Spike relay, and pick which one to use (through a switch on the OI, for example) through code, letting the LED's match your bumpers for that match
