there are several ways to do it. unfortunately, i only know one of them. i just picked up a bunch of flashlight bulbs at the local RadioShack, some wire, some batteries, and a little bare metal foil. I wired four bulbs in parallel and hooked them up to a battery source (outside of the car since you cant fit enough batteries inside the car to make the lights shine bright enough. i placed the foil on one side of the bulb so that it didn't light up the interior of the car or the engine bay. here are some of the pics of the finished product. the car is being displayed in the tiny imports gallery.
your other options are using LED's but im not sure how to wire those. i think you have to have resistors in series with the led's for them to work without burning out, but thats about all i know. and looking for information on the net about how to use LED's has so far been fruitless for me. if anyone knows how to do that please let us know.
