The simplest, most beautiful floral trend: rooting plants in water. All you have to do is snip a plant at the base of a leaf and place it in fresh spring water in a glass vase. I imagine this doesn't work for every kind of plant.
DIY - Weed killer - When nasty weeds pop up, don't reach for the weed killer. Douse them with vinegar, lemon juice or boiling water instead. The weeds will likely shrivel in a day or so. Resilient ones rarely withstand a second treatment.