I'm currently torn between an all-black control panel and going with some artwork, but I don't want it to be too busy. I will be using all RGB LED buttons, a RGB LED trackball, chrome spinner, and RGB LED joysticks. Current layout is below and also a sample of something I quickly threw together. The design is the font (the letter O) from Arkanoid, one of my all-time favorites. I don't like how the 6-button layouts look (overlapping graphics), but I don't have the ability to make it perfect. Thoughts on the Arkanoid graphics? It's minimalistic as it is, but I also don't mind the idea of plain black, since it will be pretty lit up.
My side art is currently the old High Impact Football artwork (refurbed cab), which I may go all-black with eventually (plain black laminate). Will be changing all my t-molding to chrome.