Color the Eggs- choose your reward

I have many students who want to eat lunch with me, play games with me, and do other various things throughout the day.  I've done in the past where each group has a puzzle they are trying to complete to earn a reward.  I have always set what the reward is (eating lunch with me).  So in April I'm going to try to let the students write down what they would like as a reward and color in eggs to work towards earning their reward.  Anyway, here's what I've come up with.

Student reward charts

How to earn their reward and possible rewards