Alternately, use a string of multi-colored LEDs that change color the faster you go. You could hook up a generator in one of the handles. (Like they do in these: http://www.aliexpress.com/item/NEW-Water-Glow-3-Colors-Changing-LED-Light-Kitchen-Bathroom-Faucet-Temperature-Control-TE-shower-head/32427171595.html)
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