For the colors, I actually used a purple Fanta Soda can and cut the cuttoff edge tracing the original 3 series one and then mounted the new edge over the older one about 1 mm higher.
1.

(First pic kinda got screwed by my digicam)
2.
It made a world of difference. Originally, the 3 series units had very little color when I tested them on the wall. This drove me to do this mod and now my car looks like 5 series or the new Mercedes when approaching in the opposite direction at night. Pretty clever huh?