holy crap, this is awesome. change audiosurf to a white background and the effect inverted. Start a song so you can open the options again and see them inverted, then edit the car colors so that they look normal (red, yellow, green, blue, purple).
This looks way better than the standard black background because with the white background, all the different shader effects and transparencies and objects show up a lot better. Then inverting it makes it black again, but retains the benefits of the white background. Editing the car colors is necessary since it's confusing having those inverted