Bake cake according to mix directions. When cake is completely cooled crumble into a large bowl. The mixture should resemble fine bread crumbs. Add container of frosting and blend thoroughly. Roll into balls and freeze on a sheet pan for 1-2 hours. Melt chocolate and shortening in microwave safe dish. Try 45 second intervals and stir. Dip balls into melted chocolate and immediately place on a wax lined sheet pan. Finished balls can be decorated with melted chocolate wafers. Place in a sandwich bag and snip corner off to squeeze swirls onto balls.