For a more vibrant color, add a few drops of purple food coloring to the gelatin mixture. Get creative with your molds! Spider rings, skull shapes, or even simple muffin tins work well. To easily remove the Jell-O spiders from the mold, briefly dip the bottom of the mold in warm water before inverting onto a serving plate. Consider using black licorice whips, cut into small pieces, as an alternative to straws for the legs.