Icing is one of the main ingredients you put on cakes. They are mainly used for decoration and taste. Sometimes even for artwork. Icing can be formed into shapes such as flowers and leaves using a pastry bag. Such decorations are common place on birthday and wedding cakes. Chef's color dye (food coloring) is commonly added to icing mixtures to achieve the desired color. Sprinkles, coloring mist, edible images or other decorations are often used on top of icing.