Doing it with rice is not super hard. It needs to be cooked the regular way first, so if you have leftovers you can try with that. Just dry it out, maybe in an oven on low for a little bit, then give it a dunk in hot oil, around °325-°350. It puffs right up, only takes a couple seconds.

You can puff rice noodles the same way, but you don't have to cook it first since it's already been processed. I like to serve Mongolian beef or some other kind of stir fry over it.