backdrop background canvas cardboard colors grunge grungy hue hues light lite paper papier shade shades soft subtle texture tone tones appearance bloom blooming blooms buttercup-family colored colorful coloured colourful colours contrast contrasting dark display distinctive edges evergreen flora flower flowers foliage green Hellebore Hellebores Helleborus Lenten-rose low-growing perennials poisonous Ranunculaceae rhizome-rooted shrub shrubbery subtle-shades toxic toxicity white