Hot Wheels Add Your Photo Birthday Cake Edible Icing Sheet : This show stopper is a must have for any occasion. Put your picture on an edible paper and place it on your cake. Image Easy to apply. Simply remove the icing from the backing sheet and place on your cake. Image is edible. Availble in round or square designs. Square icing measures 8inches x 8inches. Round Icing measures 7inches x 7inches. Begin by placing your order. Your order confirmation email will contain details on how to upload your image.