In August, I posted some interactive behavior-incentive displays. Then, this school year, I have had all kinds of new challenges. My students aren't really into music, and my school doesn't allow teachers to give food as prizes; but, most of my students love sports.
With this incentive chart, my students earn a basketball in the basket for each compliment they receive outside of the classroom. After they get ten baskets, I buy a new toy for recess.
The idea could easily be adapted to any other activity your students enjoy, and this is a simple way to remind your class that good decisions earn rewards.