Wii Sports Colors
Wii Bowling:
In Wii Sports if you hold the d-pad in different directions while loading a game of bowling you get a different color of bowling ball.
Left=Pink/Red | Down=Green | Right=Gold | Up=Blue (default).
Wii Tennis:
To change the tennis court to the blue practice court, press and hold (2) at the warning screen that shows after selecting characters. Also Hold the 1 button for the Green (default) feild.