Check out the list of 10 team building games and activities especially designed to improve employee planning skills and building trust within a team.
Great back to school ice breaker: get to know you game idea. When it is your turn reach into your bag of MMs. Answer the question corresponding to the color for everyone to hear. Eat your MM!
Listening - Even though this says "listening game for adults", I think it would be great for the elementary classroom as well. It gives students the opportunity to strengthen listening skills as well as cooperation skills, plus it would be fun!