While this recipe is using candy corn, you can most definitely replace this with alternatives if there is another sweet you'd like to use. The key aspects you're looking for is something stiff enough to stick firmly into the donut frosting. You may find gummies a bit too soft to be effective. Shape wise, triangles give the best look for the feathers, wings and beak components. This recipe isn't intended to be comprehensive and should be seen more as an idea to play around with!