background barrier brown cemented coloring colors colouring colours concrete constructed local-stone mortar old pattern patterns perspective perspectives picturesque random randomly-coursed rock rocks rough secure security shape shapes significant solid stone stone-walled stones stonework strength strong stucco surface surfaces texture textures traditional uneven variations variety wall well-built corner limestone retaining-wall rural backdrop color colored colorful colour coloured colourful form heavy irregular marble mason Mineral minerals natural nature ore patterning red stonecutter stonemason structure structures wallpaper green grey texturesMineral curves black dark crimson rusty