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 color coloring colour colouring designed fancy feature focus lines patterns perspectives rectangular shaped slabs smooth stone stonework style thin variations tiled tiles variation barrier constructed fitted fitting flat gaps security