Oh dear lord don't do halos. That one kit with the EL rings that guy is selling for P5 headlights is ok... but thats about as far as you can go.
Also, Audi is the only company that I have seen successfully pull off those LED driving lights. I guess Mercedes too. White LED strips in headlights always have too much of a pinpoint light source, unlike the Audi lights, which are almost in a refractive housing. Moral of this rant - noooooo to LEDs in the headlight housing.