Ok well here it goes...First about the leds...just make sure U test the number of volts going into the clear corner bulb, so u don't fry the leds. They are cheap and easy to replace, but u don't wanna do it all the time. This was the trick back in the day when ppl didn't wanna use neon lights and cold cathodes were too expensive to use in computer lighting.

Oh as for u guys what wanna like light up ur cars with lights yaadddaaa yaddaaa...check out this website..
www.xoxide.com
They have cold cathode lights that are like neon lights that run without getting hot. They probably aren't as long as the underbody lights u guys can get but they are of pretty good quality and bright. Some have different casing to diffuse the light differently while others are sound sensitive to flash along with ur music. I'm sure u can wire them up in parrallel and keep the voltage steady. Also u see Eds, angle eyes? I dunno how bright they are, but at that same website they should be selling EL wires, basically wire that light up...open up ur housing and run that wire round the light and BAM ur good to good...probably can't really tell ur AEs with the headlights on, but with them off they should be visable. But u probably can't get the same color as Ed...I'm sure they make different colors just do some searching...here are some pics....

http://store1.yimg.com/I/xoxide_1804_14745042
http://store1.yimg.com/I/xoxide_1801_6745872