autumn autumnal background blue branches brown cloud color colored colorful colors colour coloured colourful colours dark dead decay dry edge edges fall leaves maroon nature red reddish russet seasons shapes skies sky texture textures tree twigs variations variety angry apocalyptic bright brilliant clouds contrast darkening disturbing dramatic dusk evening fiery flaming gold foreboding frightening glory golden light lighting molten skies moody setting sun shadows shining silhouette silhouettes spreading sun sunset