Contrasts in flower arrangements can cover the spectrum. The contrast could be as simple as the colors of the plants that you use. A more sophisticated kind of contrast is one that contrasts textures. For instance, one plant could feature shiny leaves while another features velvety leaves or spiky leaves. You can also introduce the quality of contrast to your flower arrangement in the form of the shape of the flowers. Arrange a selection of flowers that feature trumpet-shaped flowers contrasting with rounded flowers.