Separate your ghosts, set them on a large sheet of parchment or newsprint. Put on some disposable gloves and mist the ghosts on all sides, using a couple coats. Set aside to dry.
Place candy melt wafers in a glass measuring cup or other microwave safe container. Zap on defrost in short intervals of about 20 seconds, stirring to see when smooth. Pour just a little in each mold cavity (just enough to make the face part). Place in refrigerator to harden, then pop out of molds.
Once the painted marshmallows are dry, squeeze some icing on to the backs of the skulls and adhere over where the ghost's faces were.
Push each Grim Reaper into the frosting of a cupcake. They should stand fine, but if you have an issue, use a toothpick to ensure it stays in place. Generously decorate the cupcake with sprinkle bones and leaves. Serve,