Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Thinking Fluently

One of the things you notice about creative people is that they are extremely prolific thinkers. They produce tons and tons of ideas both good and bad. A creative thinker is constantly rethinking and recombining ideas into different permutations.

To be a creative thinker, try to force relationships between seemingly unconnected ideas, and don't be afraid to record an idea that you're not sure is correct. You can always come back to it later and combine it with something else to get a new idea. Go for quantity in your ideas and try not to censor yourself.
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For more mind exercises: http://www.braingle.com/mind/