washi tape. I love the bottom one, with the starburst design, best; I wish I could buy it in Germany. Too bad that the few times I find a place over here that sells any washi tape, they always have the boring ones, from the same manufacturer, and never this design.
Self-watering planter made from recycled bottles. (I'd want to try this with a 2-liter plastic bottle, and cut the top off, so I could get the root system out intact for transplants.)