abstract appearance architectural background colors colours concrete decorative Designs details distinct distinctive edged edges embedded exterior external gray grey heavy interconnected interlinked light linear lined mosaic patterned pebbles protective rough secure shapes Sizes solid stones strength strong surface surfaced surfaces texture textured textures thick uneven varied various wall wallpaper brown colored coloring coloured colouring contours contrast contrasts cracks fissures flaws grit gritty layered layers levels lines natural rock rock-face rockface rocky rugged shade shadows shape shaped stone strata stratum sunlight sunny sunshine veins coast coastline color colour crannies hollows limestone ocean rocks sand sea seagull seashore seaside sharp shore shoreline stony surfacing surge surging swirl swirling tidal tides variations variety waves conglomerate quartz seam seams breaking through cracked ribbons shades of color shades of colour