Mama Roots has a very nice pdf to download that shows you how to make this rainbow from a slice of wood plus story resources to enjoy afterwards. I really want to give this a try, I think it would make a lovely keepsake gift for someone special :)
Filth Wizardry has adapted the lovely art of Kanzashi for little ones! You won't believe what these are made from so be sure to take a look. For adults who are interested in this Japanese art of folding fabric into flowers then you should check out Diane Gilleland's book, Kanzashi in Bloom. She also has a short video showing how to make one of these flowers from cotton fabric.