Press the right arrow key to change backgrounds. Click 1, 2, 3, 4, 5, 6, 7, or 8 to change colors. 1 = red, 2 = orange, 3 = yellow, 4 = green, 5 = blue, 6 = purple, 7 = black, 8 = brown, 9 = white.
Thank you to Riverstep for testing this and giving me feedback. Riverstep was the first one to try it.