You guys really took that one and ran with it!
Here's Red Edition, Blue Edition, Silver Edition, Orange Cherry, Lime, Summer, and Cranberry.
The flavor editions also have the possibility of using the Silver Edition base and coloring the Red Bull logo and text in their flavor colors, to better match the cans.
Silver would look quite stunning and subtle if the car was a practice in different paint finishes as well as shades, I think that one actually has a lot of potential to be a show stopper.
e.g. Black chrome bull and text with a silver chrome outline, metallic fleck silver where yellow would be, and a satin grey for the main body of the car?
Alternatively, an iridescent red to pewter paint finish for the bull and text would give a lovely pop of color with the car in motion.