bike child meltal metallic moto motor motorbike old play retro tim plate toy vintage abstract backdrop background city decay grunge grungy iron metal paint peeled plate scratch scratched texture urban bar blue building cladding construction geometry pattern patterns regular steel structure structures surface textures orange pink red cover non-skid oxide ridges rust San Francisco sidewalk bolt bracket corroded corrosion disc engineering rivet hole 13 cutout dial isolated lucky number meters mileage number one sign thirteen three color design gray silver