With a wood burning tool or serrated knife cut a piece of styrofoam into the shape of a tombstone.
Carve out RIP.
Fill in the lettering with black acrylic paint.
Add some green and yellow paint for moss.
Add a light coat of gray and black.
Careful not to cover your lettering.
Distress by dripping watered down acrylic paint along the top.
Add a coat of sealer.
Add a wooden stake to help stick in the ground (also to kill vampires).
Display and spook your neighbors!