Dissolve gelatin in boiling water. Add cold water and stir until mixed and set aside until ready to use. Prepare cake following the package directions for a 13x9 pan sized cake. Let the cake cool for some time. Using a meat fork or a bamboo skewer "poke" holes to the bottom of the cake about an inch apart, you can do it at random or in a pattern it's up to you. Pour the liquid gelatin into the holes! Beat together the topping ingredients until stiff peaks begin to form, add food coloring if desired. Frost your Halloween poke cake, sprinkle with candy corn for decoration. Allow to chill so that gelatin sets. This recipe can be altered for other holidays and themes as well but changing the flavor of gelatin and adding food coloring to the frosting.