abstract backdrop background city dark decay design gloomy grunge grungy iron metal old rust rusty scrap texture urban vintage blue chain chains child children chute green ladder park pla red steps swing swings yellow broken clock clocks dead glass meter meters stopped time crack damaged dirty industrial orange oxidation rough scratch steel washed white brown buoy corrosion corrosive decayed high mooring resolution sharp surface wallpaper aged beautiful element retro rustic colour colours hue hues shade shades spatter spatters tone tones variations