Just thought I'd add a jpeg of my bartop control as I had this dilemma and added the background circles and star to compliment a "plain" front colour with gradient.
I added yellow/red text (disko font) and sent the circles/star to the back behind the blue as this softened their look. My stick ball tops are orange, hope that helps.

This is still a work in progress although my month trial with illustrator ends on Sunday and it better be finalised by then! The white section of the gradient is on the front of the cpo and the buttons (pause and enter) are below on a slightly set back piece.

btw, this is my first post so "hello" and be kind please!.!