Icebreakers and Warm-ups activities

Icebreakers are structured activities that are designed to relax learners, introduce them to each other, and energize them in what is normally an unduly formal atmosphere or situation. Icebreakers are not normally related to the subject matter, where as “openers” are related to the subject matter that is to be discussed. In addition, they often help to break up the cliques and invite people to form random groupings in a non-threatening and fun way.

http://www.nwlink.com/~donclark/leader/icebreak.html

http://www.educationworld.com/a_lesson/lesson/lesson343.shtml