I use a type of token economy in my fourth grade class. Students are rewarded with ink stamps for various behaviors like walking in line quietly, having neat desks, and doing homeworks. The stamps are redeemable for grab jar treats. The current rate of exchange in my room is five stamps per one treat.
The students seem to enjoy receiving stamps. Some of the students have even organized their stamp books so that wizard stamps go on one page and zebra stamps go on the other. The girls tend to be more particular about this than the boys.
One thing I like about the use of stamp books is the sense that I'm rewarding positive behavior. If Jeremey isn't walking in line or Stephanie is off task and talking, all I have to do is remind the students of my expectations.
"I like the way MOST of you are walking in line. Today everyone who was walking in line will get double stamps."
"I like the way most people are working quietly. If you think you were working quietly, take out your stamp books and the class stamper will give you a stamp."
The students who aren't behaving appropriately quickly realize that they're being left out - and most of them will make an effort to amend their behavior.