Games make us feel like a kid again. They relieve stress, create bonds, motivate, help us retain information better, help us practice skills, and are fun.
There are several games that promote teamwork. You can search the internet and find many. There are also many new collaborative and cooperative board games on the market today. Try one out and see how it goes.
You can make your own game. Turn a brainstorm session into a contest with awards for the weirdest, cheapest, or funniest ideas. Use your imagination and get your game on.