Spirit fingers, glitter, the whole nine yards.
Choose a day every month that students with enough points can participate in (pajama day, crazy hat day, superhero day, whacky tacky day… the possibilities are endless!)
It can also be an individual reward: have the student who receives it design the spirit day.
Superhero Day? Sports Team Day? Crazy Sock Day?
Let the choice be up to the student and watch others jump on board with meeting their behavior expectations!