I have a Superhero/Superkid themed classroom. I use these “Super Bucks” as classroom dollars. I print them on copy paper and laminate them. My students earn "Super Bucks" for super classroom behavior. After a couple of weeks, I allow the students to trade in their hard earned "Super Bucks" for small trinkets and prizes in my classroom store.
(There are eight "Super Bucks" on each page)