I LOVE using these in my classroom!
My school has a school-wide behavior system that involves "Mustang Moola" other schools I have been to have similar things such as "Gator Bucks" or "Cougar Cash." The kids would have TONS of these little scraps of paper from Related Art or other teachers. I had no clue how to reward them for being awesome kids! One of the Interims I did gave me this idea and I made some coupons that work for my room. Every 10 buck the kids earn they can turn in for a coupon to use at their discretion.