My girls made theses last year from something we got off Pinterest. Basically you take some used water bottles and color them with permanent markers. Once they are all colored and decorated you simply use a pair of scissors and cut the bottom off the bottle then you cut around the bottle forming a spiral shape. You hang them from the neck using some string or fishing line. They were very beautiful when the sun was shining on the, How ever the color only lasted a couple of weeks and then it was faded out. The lighter colors like yellow and green disappeared completely. It was a fun project and they were beautiful while they lasted. Let me know if you give it a try and how it works out for you.