Split the students in teams and assign each team a task to brainstorm - e.g. think of the most uses for a paperclip. Let them 15-20 minutes to discuss and then compare the results in one big team.
BONUS:
100+ uses for a paperclip: http://www.xrysostom.com/paperclip.html
BONUS:
100+ uses for a paperclip: http://www.xrysostom.com/paperclip.html
