I order small items from the Oriental Express magazine to use as positive behavior incentives. I place small decorative boxes around my room and write the word LOVE on them. If I notice a student doing a kind deed or putting extra effort into a task, I ring my cordless doorbell and that student gets to pick a Love Box. As soon as the class hears the bell they know that someone just did something great. I explain who won and why. The student gets to choose one of the boxes and take the prize from it. Then I refill the box and use it again.
This is a great way to recognize positive behavior in the classroom.