About.com suggests placing a mirror under the centerpiece vase to add a touch of sophistication. Another idea is to create a tropical look with watery blues and sunny yellows.
Sometimes, creating a centerpiece with only a couple of stunning flowers has a greater visual impact than an overflowing bouquet. Examples of good color combinations for flowers and vases include yellow and blue, red and white, and pink with green. For a different twist, create a series of small centerpieces along the table instead of a large one in the middle. To make small centerpieces, use china teacups and place one large rose or a cluster of small roses in each cup.