blue cloud clouds colored colors coloured colours conditions contrast dark darkening darkness disturbing dramatic formations gray grey heavy light lighting moody Morning movement perspectives shapes shining skies sky spreading sun sunrise textures variations various cloud formations weather appearances arid Cacti cactus clumps clusters coloring colouring display edge edges flora frilled frills garden-display garden-plants green irregular leaves ornamental perennials plants pointed protection ribbed ribbing ribs shape sharp short-spikes small-spines spikes spines spiny succulents sunlight surface surfaces unusual variety various abstract appearance background blended cloud-formations setting-sun southern spread sunset thin various-cloud-formations white winter wintry