I've got not practical experience in that area but I think this is what I'd do:
NOTE: LEDs get hot really quickly so don't leave it on for too long!
Keep us posted on how things go okay? Good luck! :cheers
- - get 2 or 4 LEDs from some place like Radio Shack (should be available in blue, purple, red, green)
- drill holes so that you can insert the LED from inside the car
- use a glue gun to keep the LEDs in place
- LED has a positive and negative side (do NOT wire them up incorrectly!)
- need a low profile switch (no immediate ideas here)
- I think 2 AAA batteries should light up the LEDs pretty decently
NOTE: LEDs get hot really quickly so don't leave it on for too long!
Keep us posted on how things go okay? Good luck! :cheers