Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Brainstorm Rule: Build on Ideas

In a Brainstorm [ For more on 'Brainstorm' go here: http://www.braingle.com/mind/84.html ], you don't need to come up with completely unique, original, and fully formed ideas. If everyone did this, the meeting would be very quiet while everyone sat and thought, and you wouldn't end up with very many novel ideas. The best ideas come from a collaborative effort of springboarding off one idea to arrive at another improved or modified solution. After you have built on the original idea several times, you'll have something completely new that you never would have thought of on your own.

Never hold back because your idea is only partially formed or incomplete. The other brainstormers can build on it and turn it into a possible solution. Even a little random thought could provide the spark that gives someone else a great idea.
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For more mind exercises: http://www.braingle.com/mind/