This may be old hat to our UK readers, but the Ban Beater device is a gadget that helps you recycle your used bathwater for outdoor use. After you bathe, use the Ban Beater to suck up the "greywater", take it outside, and you've got enough water to feed your plants. You could technically use the water to wash your car, but considering the stuff coming off of your body when you take a shower, we wouldn't recommend it. Either way, you're saving money and water by repurposing your own filth.
Available now for 39.99 ($73).
Product Page [Ban Beater via Tree Hugger]