I've never thought of making those super-thin omelets (usuyaki tamago) you sometimes find in Japanese dishes—I assumed reaching that thinness would take more skill than I possess—but Biggie at bento-making tutorial site Lunch In A Box shows the easy way to make them by cooking them in your microwave. With an appropriately-shaped plate and plastic wrap (Biggie includes information about the safety of microwaving plastic wrap), you'll be churning out these egg sheets in no time. Chop up the egg sheets to use as a garnish or keep them whole to use as wrappers around other foods.
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Of course, you can make these without a microwave; go to Just Hungry for directions on how to make them in a pan.