kindergarten color wheel umbrellas with fingerprint rain. Not sure what kind of colour wheel this is, but I like the concept. I find it helps for future concepts to always have the complementary colour directly across from it's mate.
Nature Mandala ~ Take your storytime kids on a nature walk and build a collage out of what you find! Maybe try this as an excursion. Or collect heaps of things from nature, hide them around the room and go on a treasure hunt