When I was in grade 4, our teacher "paid" us every day in monopoly money. Everything had a cost - going to the washroom during class, sharpening a pencil, etc. And there were fines for being late with your school work, or being disruptive, etc. This went on for the entire school year.
It seemed to work at least a little, because people got really stressed out when they were running out of money. This was mainly to teach how money works, but it probably had bonus behavioral side effects to boot.
