Cute centerpiece idea. You will need a large container and then a smaller container that can nestle inside the larger container. The large container will hold your lovely legumes while the smaller container will actually hold the flowers and the water. Once you have both containers in place, slowly pour your beans of choice into the space between both containers; keep the smaller vase centered as best as you possibly can. As soon as the beans are snugly set, let your imagination run wild!