What you needDisposable rubber gloves
Plaster of paris
Skin colored and red acrylic Paints
Purchase some Plaster Paris or other casting plaster and follow the directions on the packet.
Make up enough plaster to fill the fingers of the gloves. To measure this fill the fingers in the glove with water and pour into a measuring cup. This is the amount of plaster mix you will require.
There is no need to prepare the gloves as we will just rip the glove off afterwards. Pour your plaster mix into the fingers of the glove and tie off with a rubber band to stop the mix running out.
Sit the filled glove down on a flat table or hang it up to allow it to set.
Once the plaster has set remove the glove and take out the fingers. Break off any mis-shaped pieces.
You should have what looks like a broken off finger.
Use your paints to paint the stumps of the fingers red like dripping blood and the other parts a natural skin color.