Add usable space to your yard. Here a troublesome slope was turned into a deck. The deck was carved into the hillside and surrounded by a retaining wall. Same principle to build nice size pool with deck area.
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.
Our beadboard drying rack attached to the wall in the utility room. The panels fold down to provide drying space for even the larger family. For sale in uk now on brilliantlybritish or something. Think called July?
fruits like figs, blueberry, lemon, etc in the espalier growing method along your back fence. It is a way to keep plants tamed, but also increases production because the plant is using its energy to produce fruit instead of leaves and branches.