"Hump the bed" while wearing pantyhose, as long as you don't mind getting cum on the sheets, as well as in your hose! While you're doing it, rub your nylonned feet together and up and down your legs.

As for giving yourself a nylonned hand job, using a knee high will mean less fabric to clean up afterwards, as opposed to a pair of pantyhose. And if the knee highs are a worn pair "borrowed" from a girl, roll one knee high up over your hand and arm and sniff her foot scent while you masturbate into the other, or even stroke your nylonned cock with your nylonned hand.