For this game you'll need a long rope and several blind folds.
Gather the group together, have them sit in a circle and place their blindfolds on their heads. Take a rope with the ends tied together and give it to the group. Their goal is to form a perfect square out of the rope without taking off their blindfolds.
Allow them as much time as they like - once they are happy they have formed a square, they can take off their blindfolds and observe their handywork.
Variations of this game include preventing some team members from talking.
Themes that will come out of this game include leadership, communication, team work and trust.