I am made a Star Wars (Kylo Ren character) cake for a friend's child, and they wanted a galaxy cake board. I do not have airbrush equipment, so this is done with Wilton Color Mist sprays (violet, blue, black) and a spray bottle of homemade navy color (Royal Blue gel, Black gel mixed with some rum). I dabbed areas with wadded paper towel then splattered white icing on with a toothbrush. I then hit it with a little metallic shimmer spray and sprinkled areas with metallic pewter colored sanding sugar.