My all time favorite big/little reveal has to be when the whole chapter stands in a big circle with a little inside of it. Each person has a candle and the little walks around the interior and then blows out the candle of girl she thinks is her big.

Or

Same set up but the little has the candle and walks around the inside of the circle and her big blows her candle out.

P.S. Just to keep it fun for everybody do it one by one and when the littles figure out their bigs, just have them set outside of the circle. It takes away the fun for the last couple of girls if there is only a few people left to guess from.