abstract background cold dark design gray grunge grungy ice pattern winter dept dissent down dungeon Gave hell stairs tombe tunnel Underground antique backdrop book copyspace old texture aqua atmospheric blue color coloration colour contrast cooling dark-blue deep direction electric-blue flow glassy interconnected interlinked light liquid liquidy movement perspectives reflecting ripples rippling surface surfaces surfacing textured textures variations vibrant wallpaper water watery waves wet clouds coastlines colors hills mountains rocks sky cloudy dusk lightin Morning night sun sunrise sunset mirror reflection reflections wave