Rewinding a bit to clarify a technical point I noticed earlier in the thread...

I could do about 8-9 of the usual "crayon box" colors for a start, and then the 5 metalized ones. All of the regular colors can be lightened or darkened into other shades. For example, red could be adjusted from "pink" all the way into "blood red".

When dealing with the colors of the buttons, there's an interesting issue to deal with. Unlike the "Holy backlit buttons, Batman" image posted earlier in the thread, most people will be buying buttons to match their player's lens color, which in turn was chosen to match their car's dash as best as possible.

This would be neat if you could just copy the lens color as a basis for the tint of the button plastic. But you can't, because...

The lenses go over the VFD display which glows a shade of approximately cyan. The buttons go over pure-white LEDs. If customers wanted the glow of the buttons to exactly match the glow of the text on the screen, some trial and error would be needed to determine the exact color shades of plastic to make the buttons appear to be the same color as the screen. Brian did some experiments in this area with moderate success, by (for example) tinting the blue buttons ever so slightly greenish to match the blue lens over the cyan VFD.