Another twist on single stems of flowers: Group several tall, thin vases. For each, cut a single flower so that the blossom reaches just to the rim of the vase. Flowers with pliable, curvy stems, like a single tulip or water lily work best. Vision small glass vase, $25; medium, $30; large, $45; extra-large, $80: Cocoon, www.cocoononline.com.