I'm going to use Mr. Pototo Head for my classroom management.  We will start off the week with an empty potato head.  Everytime the students are on task, we will add a piece to him.  The pieces can come and go according to their behavior.  Once he is completely put together, we can have popcorn and a movie during their lunch time or some types of whole group rewards.  It could take three weeks to put him together or it could take only a week.  This is only whole group incentive.