Bake your favorite cake mix in two round pans, according to the package directions, but do not stack them. Frost each layer separately with white frosting. With chocolate frosting, make four concentric circles on each cake layer. (similar to the pictures below) Starting at the center of each cake, pull a knife to the outer edge. Repeat this seven times to create a spider web look. Make your own spiders using gumdrops, with licorice legs.