Got an old backyard swimming pool that's sitting empty? Turn it into a self-sustaining garden! That's what this Arizonan family did:
When we purchased our first home in Mesa, AZ on October of 2009, it came with a large, empty, and run-down pool. Rather than spending thousands of dollars in fixing the pool or having it filled with fill dirt we decided to design an inexpensive & self-sufficient urban greenhouse. Initially, we had anticipated self-sufficiency by 2012 but we achieved our goal by mid-2010. Our family gets about 8 fresh eggs a day, unlimited tilapia fish, organic fruit, veggies, and herbs 365 days a year.
Link - Thanks Tiffany!