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.
Flower arranging today is more than merely putting together a bunch of bright beautiful flowers in a pretty vase. Much thought goes into the art of each professionally designed bouquet. The artistic nature of flower arrangement means that no strict rules need to be followed by designers, but there are three very distinct styles into which arrangements can be categorised.