cement cracks effects pink rocks stone texture tiles concrete board fence grain knot red stripes wood crackling paint wall abstract composition nature surface textures vegetables ba1969 bound broken chains cracked grunge pattern torn appearance background breaking through brown colored coloring colors coloured colouring colours contours contrast contrasts fissures flaws layers levels light lines natural ribbons rock rock-face rockface rough rugged shade shades of color shades of colour strata stratum sunlight surfaces textured veins wallpaper backdrop brush chaos concept damaged decay element fill grungy marks mask metal old paper scratches shapes stains wear and tear worn city crack pavement route town track tracks