Despite his coarse attidute (which is his nature, get used to it), Snaaake makes a good point. After years of webpage design experience, I can tell you without a doubt, that in any color scheme, you want to use each color more than once and in some sort of pattern. For instance, the SF setup with red, white and blue, but you even have to be careful with that one (looks bad on a busy background). Or, for instance, in my cab, the cab and joysticks are going to be black and the logos and buttons will be yellow. Your setup just seems too chaotic.
The exception to this rule would be neo geo cabinets cuz that's just how they are, and there're only 4 buttons anyway.
I actually was thinking on my cab I was going to do a fire theme and have the 6-button setup go red, orange, yellow, but it's too late for that, i've already got all my stuff. Perhaps on my 4-player CP.