Put very succinctly, architectural effect depends upon a nice balance of horizontal, vertical and oblique. No rules can say how much of each; so nothing can really take the place of feeling and good judgement.. ~William Morris
Iris is seamless. It makes an excellent border tile.
Iris, Blue and Yellow Irises, black leaves, brown birds, cream background
Blue and Pink Irises, blue birds, white background
Blue and orange irises, wine leaves, off white background
Iris, purple and rose irises, light leaves, dark background
Blue and Orange Irises, indigo leaves, pale birds, off white background