The Waterpebble Helps You Take Shorter Showers
If you're looking for a way to better understand your water use/shame yourself into using less, check out this Waterpebble device:
The device is placed at the bottom of the shower, where it keeps track of all the water being poured down the drain. If users take ultra-long showers, the Waterpebble's LED light glows red. If water is being saved, the device glows green, and if just enough water is being used, the Waterpebble glows orange. Instead of holding all users to the same standard, the device keeps track of how much water is used during the first shower after it is activated. Every shower after that is judged based on how much water it uses compared to that first shower.
You can buy one for $5 here.