To spray paint clothespins (or similar things), clip them onto an old cardboard box and tape the flaps up. they'll dry there and you won't have to worry about waiting for one side to dry at a time. Might use clothes pins for my traffic light next year!
Primary Possibilities: Positive Behavior Rewards SECRET STUDENT--so much fun, Love this idea! If the secret student has done well then all get a positive reward. All have to work hard just incase it's them.