Milkcrate Composter (vertically stacked) - I intend to make one of these, or maybe two or three, to keep out by the garden. What a great idea! Super cool, apparently composting isn't as easy as creating a heap! At least I hv one crate do far!
DIY drip irrigation system: bury a milk jug with holes drilled in it next to your plants. Stick the hose in the top of the jug and fill with water. Also works for feeding: add a scoop of fertilizer into the jug and add water.