Depends on if you want it to pop or not. You could use black or brandywine for a subtle contrast or something in the lines of silver, gold or yellow for a more vivid pop. A good way to decide is to spray a metal panel, about the size of a license plate with the black cherry. After it is cleared and has dried sufficiently, put a piece of frisket (clear, low tack plastic) over it. Then put the accent colors you might like on the plastic. When you decide which one looks good, you can peel the plastic off and paint the panel to see how it will really look, plus you now have the color scheme of your bike. Add some lettering, like your bikes name and model to the painted panel and you have something to hang or display. Frisket can be found at any hobby shop like Hobby Lobby, Michaels, etc. Clear contact paper will work too, just make sure it is low tack so it will remove easily.