This is a video of me making a prototype for the Toilet Gardener, a planter that replaces the cover to your toilet reservoir, pulling moisture from the tank and making watering unnecessary.
For the prototype, I used a plastic seeding tray, but I think if someone produced a porcelain equivalent, sold along with a seed kit etc. (like the chia pet), they could make a lot of money.
I used grass seed, but the ideally the planter would grow herbs etc. creating a living potpourri.
To read more about this idea visit ideasbychuck.com.