This is a really fun activity that will get your kids' senses smelling. In advance purchase a small packages of red, orange, yellow, green, blue and purple Jell-O, generic is fine. Print the page below. Have the children paint the smallest strip of the rainbow with glue. Then sprinkle purple Jell-O onto the glue. The Jell-O will turn darker purple and will smell wonderful. Shake the excess Jell-O off into a pie tin. Continue until all the colors have been used.