Students earn non-tangible rewards (except one free book pick) for positive behavior. I use Babblin' Abby's Rock Star Behavior clip chart in my classroom. When students clip up to the top two colors in a day, they can add a jewel to their clothespin. When 5 jewels are collected, they can blindly pick a reward card! I flip the clothespin to the other side to start collecting 5 more jewels...When the clothespin is filled on both sides, the student can keep their rocked out clothespin and start fresh with a new one! I've been using the reward cards for 15 years (did some modifying along the way).
Kids LOVE these!