definitely making these! How about adding a string of white or clear christmas lights to them. You can get them so cheaply with green wires but they can be covered with white tape or spray painted white or even left green. I think the different size "globes" would be awesome when lit up!
Mix 120 ml glue, 120 ml cornstarch, and 60 ml cup warm water in a large container until all lumps are gone, then cover each balloon in vaseline. Dip twine or hemp into mixture and wrap around balloon. Leave on for 24 hrs to dry, pop balloon and apply clear fast drying spray paint on hardened hemp.