omg I thought of an idea and almost wet myself... here goes...
1)
www.coolneon.com, they have tiny tiny neon wire that is just small enough to fit under a bc-g
2) get a NiMH battery and put that into your bc-g (I just bought one from QFM )
3) coolneon has instructions on how to solder a lead wire so that you can set your own power source
4) here's the tricky part: connect the NiMH battery to the neon, and then loop, and glue (or however you can attach it so as not to move around while trying to drive) the neon around the front top, and down the sides then right over and b4 the motor plate.
The NiMH has enough power for a gigantic charge, enough to run wire that size for aslong as a normal bc-g will run. AND BAM! neon on your bc-g. I know you guys would rather use LED's but this will look so much better. oh.... and your car may need extra paint so that the light doesn't leak thru