I simply place an award in the middle of the team to acknowledge they are working well together. When the team has 5, I allow them to chose a small prize or treat. They turn in the awards and start over again to get a new reward. Since I don't want interruption during instruction, they can only notify me that they have five by quietly raising a hand. The reward is given either right before lunch or right before dismissal. Plus, when a team is off track an award can be taken away. These help to send a message to the rest of the groups. Great help for subs!
I've included meaningful quotations to discuss when time allows. There are other sets which will be added to TPT in the future.
Graphics from Graphic Garden.