Cute rainbow dust on a lilac background. Make a connection with these rainbows! Rainbow Dust by Kate x Kasey for Paintbrush Studio is a beautiful fabric collection made of 100% organic cotton and ink that’s GOTS and OKEO-TEX certified. Plus the cotton is made of a double gauze so the fabric is light and soft. This cute fabric collection highlights the colors of the rainbow in a unique way, by creating colorful dust on solid colors like yellow, blue, white, and more.