I needed to join two pieces of gingerbread and didn't want the joint to show. I played around with food color and was having trouble getting the color to match the gingerbread. About two in the morning (when I get my ideas, unfortunately!) it occurred to me that what gave gingerbread it's color were the spices. This morning I mixed cinnamon and ginger into royal frosting and it didn't take long to get the color perfect! The spices thicken the frosting, so thin it a bit.