We’ve seen Farm Fountains, and the idea of fish-waste-into-fertilizer has inspired many a green design. But Growing Cities is on a mission to grow crops in every corner and nook of available urban space — the nutritious, legal kind of crops. Their designs range from window-sill-sized units to housing-project-wide farms, including hydroponics, rooftop greenhouses, and lettuce growing inside your desk. Now if someone could just figure out how to keep a goat in a living room. . .