After receiving samples of 7 or 8 colors, I decided to go with the light blue. I really liked the dark red and the green, but they were so dark that you couldn't see much through them. I went with two of the Cointaker blue pop-bumper 4+1's led's in the planet and one of their red 13 led flashers. I also dropped the subway circuit board with the lights on it down about 1.5" and used the Cointaker flex supers to create nice even lighting under the planet.
Another plus with the light blue ring is that I can change the color of the planet to other colors and it seems to match just about anything. The planet in purple looked really good as well.