Cut one of the corners off of a ziploc bag (or you can use a piping bag if you have one)
Fill the bag with frosting and seal the open end shut...to do this with a piping bag, twist the end a couple of times. For the ziploc bag, just zip it shut.
Pipe the frosting on to the tops of the cupcakes. Start at the outside edge of the cupcake and go around in circles toward the middle until you have covered it (kind of like you would if you were serving a soft ice cream cone)
Adding the Blood
Drizzle the strawberry or raspberry sauce over the top of each of the cupcakes. Be careful on how much you add...if you put on too much it will make a big mess of your cupcakes!