background coarse diamond plate diamondplate grunge industrial iron metal non skid plate rough rust San Francisco sidewalk steel surface texture urban ba1969 grid rustic rusty Built Structure church frankfurt germany non-urban scene old rural scene small spring. blowball Dandelion field flower meadow nature spring sunset Tranquil Scene blur bump tiles New York non-skid nubs NYC subway threshold yellow agriculture farmland fields grass green green fields landscape meadows summer animal dog Labrador Retriever Leaf Farm outdoors pet retriever tree cover oxide ridges age aged grit Portland surace weathered asphalt diamond-plate barley blue golden grain fields rye wheat white