This is great for Halloween. You can create a graveyard using vegetable dip for the ground, broccoli for the trees, mushrooms, green onions, etc. and then place your ghosts. I started off with the graveyard at our annual Halloween party but they went so quick that I now make 5 dozen ghosts.
You can use your own deviled egg filling recipe. Any will work.
Find thin spot on hard boiled egg (all of them have one) and cut hole about the size of a dime. Use knife or small spoon and remove yolk carefully. I use a knife since you can break it up and shake it out. Try not to make the hole any bigger. Once this is done turn egg to other side and use a straw to make two round eye holes and a mouth. Make sure the holes go all the way through to the center of the egg. Mix up the filling and put in icing bag or make one out of parchment paper. Fill the space that the yolk was in full. If it pokes through the eyes and mouth, that just makes them look stranger; the better for a "spooky" party.