Chicken wire balls, looks like they just shape and cut around a ball and fastened it to an electrical fence post. The bubbles look like something I am doing right now using 100mm (4 inch) plastic fillable clear ornaments. It has the hanger on the ball, all you'ld have to do is put it together with one side up and one side down and then do heavy wire to make the post maybe? not sure on that part.
