abstract architectural backdrop background barrier brick brick-wall bricks brickwork cement clean colored coloring colors coloured colouring colours constructed exterior external firm linear lines mortar perspective perspectives rectangular secure security smooth solid standard strength strong style surface surfaced surfaces texture textured textures traditional-brick-wall variation varied various wall walled wallpaper well-built angles curved curving rough-work off-white purple bolders boulders cemented coated concrete cover covered erosion-prevention fitted hill random randomly-coursed Rendered retaining-rocks retaining-wall rock rocks rocky rough rugged slope sloping stone stone-walled stones stonework uneven variations variety brown building concept construction creation decay design dirty fill floor graphic grime grunge illustration image industrial industry masculine mildew New original pattern pavers render scrapbooking stains tiles unique urban vector vignette dez pain xymonau