I stumbled across this amazing example of creative reuse at The Growing Gardens Project. It is a community garden at Deen City Farm, London, run by project coordinator Louisa Loakes and a regular stream of volunteers. In May of last year the residents of the community of Merton volunteered their time to turn 5000 plastic bottles into a roof!
Dubbed, "The Fizzy Bottle Roof Project," money donated by a regular visitor and admirer of the garden made the project possible. That gesture of goodwill that ignited the community. Even a local company donated storage space to keep the huge number of plastic bottles that the community collected over several months.
The concept was making do with what you already have. All materials used in the building were waste materials collected from the surrounding neighborhood.
For more photos and further information on the project, visit OpenBuildings.com.
(Images: Louisa Loakes)