1. If desired, in a well-ventilated work area, cover the surface with newspapers. Spray-paint the foam balls black. Let them dry.
2. Cover a small area of each ball with glue. Place beans on the glued area, trying to keep the beans in horizontal rows. Allow each section to dry before starting a new area.
3. Place the seed balls in the cornucopia, tucking in sprigs of bittersweet to fill.