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This interesting flying machine looks like a Jellyfish flying around. Looks like Mylar film is the choice of lightweight film for these ultra light models.
Via: Make
 “The prototype has a motor-powered crankshaft that alternately flaps opposing pairs of petal-shaped wings. Though its Mylar film and carbon fiber body weighs less than one-tenth of an ounce, its stability stems from its bottom-heavy design, which lets it wobble, but not flip over. Indeed, its designers argue that the flying jelly is more stable than robots based on insects or birds, which require a tail, sails, or a feedback system to stay upright.”