HMMM...lets see in my Barracora, I have color matched 180 wide leds from Cointaker under the inserts....and under the clear ones in the bonus area, I have purple (my fave color!!)...When I redid it I changed the posts to purple, and I have purple Clippy posts on it also. The purple ties into the purple in the BG...For GI, I might try some cool white 180 wide, they give off a sort of blue tint that would probably tie in good with the blue plastics and such. They are a bit brighter than the warm white, and the warm don't give off the blue tint...Maybe try the same in the GI in the backbox...the wide spread the light out a bit more than some of the others so you don't have the "spots" of light effect. I have the 4+1's in the pops, you can color match them to the caps or just use the cool white, because the yellows tend to not have as much of an effect as some of the other colors.
I love picking LEDs...that is half the fun, just get a selection, and start playin' with them to see what you like best!
Phoebe