Wow, great idea, and the manufacturer actually explains it for DIY-ers! It doesn't really heat a whole house, but for a small hut, it could work on cold spring/fall evenings when you don't want to start the wood stove. You could use it in a small room.
DIY Stacked Pots : This is a great idea for annuals, herbs, and just about any plant or flower the drapes over the pot. Try using pots that don't exactly match but provide interest. Yard sales are good place to find pots.