abstract backdrop background blue brown decay detail gray metal ol rust rusty silver texture urban Dirt dirty metallic panel panels sand sanded spoil spoiled steel deteriorating deterioration discoloration empty exposed external frame iron memorial monument neglected old plate shadow shadows sunlight textures wear weathered worn autumn autumnal colors dry fall leaf leafs leaves orange pattern pavement red degrade drain drainpipe grunge pipe rain rusted rusting threads abstracts backgrounds brush depressing desktop drab fill green grungy messy shapes wallpaper