I love my water-saving Evolve Showerhead, which prevents a few gallons of water from going to waste while I'm waiting for it to heat up.
Another novel method of saving shower water has been envisioned by the the student-peopled Samsung Design Membership: The Reduce-Your-Use water-saving bathmat, which is meant to be connected to the tap. The idea is that the pressure-sensitive mat knows when you've stepped out of the shower spray, as we tend to do when we "soap up," and it then cuts the waterflow. Step back towards the spray to rinse, and the agua comes back on.
You can check out other water-saving design concepts by the Samsung group at Aspen Design Challenge's "Designing Water's Future" page.
via fast company