If your egg or oval does not have an inset you will need to cut out an oval shape inset into one side of your styrofoam shape. It doesn't need to be exact or perfectly smooth.
Fold a 6" piece of wire in half. Dip ends into glue and stick into top end of ornament, let dry. Or if you prefer, you can use a metallic tinsel stem or pin a piece of metallic cord onto the top. Once dry, hold or suspend your ornament by the wire and spray with gold paint on all sides and into the inset. Let dry.
Using toothpick make a hole inside the inset at the top. Trim ornament wire hanger to 1" and dip in glue. Use toothpick to guide hanger wire into hole and let dry.
Squeeze a line of glue around the outside edge of the inset and position leaf sequins so that each one slightly overlaps the previous one. On the last sequin tuck the outside under the first sequin to make it look continuous. Alternatively, you could use sequin trim, lace trim or other suitable edging instead. Let dry.