Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Effective Associations : Vividness

The mind has a great ability to remember images and visualizations, which is why mnemonics work so well. To help you remember your associations better, you should take care to make your visualizations vivid. This means that you should actually try to visualize the association in your mind's eye. Pay attention to the motion, sounds, and colors in your visualization. The more detail you can produce, the more your memory will have to grab onto.
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For more mind exercises: http://www.braingle.com/mind/