Rainbow jelly cups are a colorful and fun dessert that kids will enjoy. Prepare different flavors of jelly according to the package instructions and let them set in separate bowls. Once set, cut the jelly into small cubes. Layer the different colored jelly cubes in clear plastic cups to create a rainbow effect. Top with whipped cream or a dollop of yogurt and a sprinkle of colorful sugar crystals. These vibrant and wiggly treats are sure to be a hit with kids of all ages.