I do a whole-class reward system called "Mrs. C's Top 5." It's called the rundown which I do at the end of each class. My Top 5 are "everyone was on time, everyone was prepared, everyone completed HW, everyone was on task, and everyone was respectful." If the class received points for all 5, they got a "warm fuzzy" (craft pom-poms) in their designated jar. After 25 fuzzies, the class receives a "reward" -- HW pass, 5 EC points on a quiz, sit by a friend, ice pops, chew gum in class, free reading period. I also have the students make suggestions for rewards. The students really buy into the program and are very honest when I ask for feedback and police each other. Also, there is a competitive aspect between each of my classes -- whichever of my 3 classes has the most "warm fuzzies" at Winter Break and the end of the year get a "bagel breakfast" or "pizza party."
BTW -- I taught 6th grade ELA/SS last year and am teaching 7th and 8th grade ELA this year. Hope my eighth graders will buy in
