Coat the inside of the jar with white paint. Allow the excess paint to drain out, and then let the paint dry completely.
Replace the lid of the jar when the white paint has dried.
Paint two large black circles to create eye sockets.
Paint a black upsidedown heart for the nose cavity.
Paint a thin, black, horizontal line for the mouth and add small arches to be the teeth.
Paint two brackets to represent the cheekbones.
After the paint has dried, cut a 4-5 inch length of orange ribbon. Fold each of the two ends back to the middle of the ribbon, and glue into place with hot glue.
Cut another 1-2 inch piece of ribbon and wrap it around the center of the bow. Secure with hot glue.
Cut a bat shape out of black craft foam and glue it to the center of the bow.
Cut enough ribbon to wrap around the perimeter of the jar lid. Glue it in place with hot glue. Add the bow tie with hot glue.
Cut a 3" diameter circle, a 5" diameter circle and a 9 1/2" x 2" inch strip out of black craft foam.
Using hot glue, turn the black craft foam strip into a cylinder. Glue the smaller circle of craft foam to the top of the cylinder. Glue the larger circle to the bottom of the cylinder.
Cut a 3 1/2" length of ribbon and glue it to the bottom of the cylinder like a hatband.
Glue the hat to the top of the painted skull mason jar.