You waste gallons of water with your morning shower, you waterhog. Start conserving with the Water Pebble. Aside from helping you simulate a relaxing babbling brook (not really), the gadget tracks the amount of water you use. A green light gets you sudsing, a yellow light indicates you should be halfway done, and a red light lets you know that it's time to turn off the water.
About $10: UncommonGoods.com