like the punch card not the treasure box. perhaps once it's punched out they earn "constructive free time choice" Behavior punch card, for every good thing they do you punch a number out. When all twenty are punched out they go to the treasure box.
(image) What a great idea for the kids / grandkids! Perfect DIY project & recycle those used / broken crayon pieces, too. Would make for a great party favor, gift for Valentine's Day (or other occasions) or gift from Teacher to Students! Love it!