Another version on rain gutter gardening. Want to grow a salad garden but have no room? Try gutters! Affix them to a fence, slope them for drainage, and voila! Of course,for this I'd need a backyard wider than a hallway.
Mine should be up and running soon! Got an apartment with limited space? A Hydroponic window farm is for you. All you need are plastic bottles with cuts in them, plants, soil, and some supports to hold it to a PVC frame.