My sister made styrofoam ghosts just like these with her daughter when she was two. Six years later they are still one of their Halloween decorations staples. I saw them when we were skyping last week was inspired to make our own ghost family. This project is really simple.
Ball point pen
1) Draw faces with a a ball point pen on inverted styrofoam cups.
2) Poke a hole in the top of each of cup.
3) Thread a piece of twine through each hole and affix with tape.
4) Hang and enjoy!