Australia blue brown bush central Australia clear-sky desert-country desert-region dry foliage gully height high hill hot inland outback rocks rocky rough rugged scrub shrubbery shrubs sky sunlight sunshine terrain textures trees vegetation abstract appearance background colored coloring colors coloured colouring colours contours contrast contrasts cracks fissures flaws layers levels light lines natural ribbons rock rock-face rockface shade shades of color shades of colour stone strata stratum surface surfaces texture textured veins wallpaper