I took Knievel's work to heart as well, (just took me a while to order all the parts) and here's what I came up with in the variety of colors of LEDs that I had available. All buttons are clear. Overall they look really good. Some of my LEDs were a little weak and looked a little washed out under "daylight" situations. From what I've seen so far I would say you need a minimum of 5,000 mcd for a good effect. Less looks good in dim or dark lighting but not with the lights on. The red is 8,000mcd, the the yellow 5,000 and the purple 3000. The other's I'm not too sure about.
For the colorblind, the colors are: Yellow, Red, Blue, Green-Blue, Pink/Purple, White, Green.