cobble cobblestone dust ground old road path pavement paver pebble pebbles road rock sand stone stones street texture walk abstract backdrop background copyspace design flat floor granite granito grunge grungy natural nature pattern wall angles barrier bolders boulders cemented coated concrete constructed cover covered erosion-prevention fitted hill mortar perspectives random randomly-coursed Rendered retaining-rocks retaining-wall rocks rocky rough rugged secure security slope sloping solid stone-walled stonework strength strong surface surfaces textures uneven variations variety walled well-built backgound tile construction unfinished brown grey brick decay ruins Spain terra village agres lime limestone mariola sierra gray limestones sundrocks white beautiful cement graphic hard mixed