So here is my finished piece. I started with two layers of gold flux, and then painted a couple of layers of liquid black enamel on top. It proved quite hard to fire for just the right amount of time - long enough so that the black fused without sinking into the thick flux underneath. I like how the black has a matt finish while the gold is really shiny - also the black is raised so it's quite a tactile piece.
Anyway, in case you didn't guess... I'm calling it the Power Button.