city crack pattern pavement route stone texture tiles town track tracks asphalt background gravel pebble road stones street tile beton brick build concrete cube grey sett square block cobble paving setts baum bricks ground pedestrian walk wall wallpaper walls crossing floor free image photo picture rule sign stock stop transportation urban ancient bouldering cobbled cobblestone massive old pathway rock rural solid structure structures textures cityscape crevice fracture roads rocks streets car park lines paint parking lot yellow abstract chalk child colors draw drawing