Single, larger blossom flowers, such as roses, carnations, zinnias, tulips or lilies, usually make up the focal points of a piece. Taller stems with multiple flowers can balance things nicely. Delphinium, gladiolus, and snapdragon are good examples of flowers that can add extra height and texture. "Filler" flowers, or stems with many small buds, are great for topping of a bouquet with a full and delicate look.
Designers of contemporary collections often combine flowers with fruits to make their arrangements good enough to eat, an abundance of fragrant sweet peas displayed in a vase full of strawberries give a terrific look to any summer dinner party. Slices of limes and lemons work wonderfully with white roses to give a clean crisp effect. Miniature trees, stripped of their leaves and replaced by single heads of pastel shades of asters provide an interesting focal point for a large room.