Trying to manage the kiddies!!

Hey guys...well as you know school is coming to an end... I feel like every year around this time my kiddies get like ancy and ready to just start summer... They start chatting up a storm and have trouble sitting down... I started this last year and it worked like a charm... I stole this idea from reallygoodstuff.com . I use it weekly and the way it works is simple: this is given to the student who has displayed self control and effort throughout the week. The person who earns this reward has the following on the back of their chair:

The kiddies feel so proud when they have earned this. It makes them feel like they have done a good job. I enjoy it because it keeps them on task and working throughout the year. What do you guys think? Have a great day =)