Well, I just did this tonight, and thought I'd share. It says in the writeup and it bears repeating: Please don't try this method unless you have fairly good soldering skills or extra bulb connectors. It's pretty easy to melt the plastic or drip solder where it doesn't belong.

That said, here's the writeup:
http://ghettomods.net/led-howto.htm

Enjoy!

Oh, here's how it looks on my car with red:


I can try to help, but this mod is quite self explanitory.

 

Typo....
"Here’s your chance to be creative. I decided not to be. You can’t replace the green tinted film on the black trim piece, and I just left it off."

should be can, not can't.

 

by Matt's superior English skillz!

Good write-up, overall...

 

I meant that you can't put the original one back on, so it must be replaced.

I'll word it in a less ambiguous way.

Thanks