While writing my third book, Extreme Halloween, I thought it would be fun to try to make different body parts out of bread. I tried a number of methods. My favorite method used frozen bread dough (I didn't bother making it myself), an egg-wash and food color. An egg-wash is a beaten egg that you brush onto items as they bake. It forms a sort of a glaze over the baked item.
In these cases, I added food coloring to the egg wash. The result was lots of fun.