3D abstract asbestos backdrop background blue cement closeup concrete construction dark decay design detail exterior grainy graphic gray grey grunge material old plaster rock rough scrapbooking stone stucco surface texture urban wall weathered ballast broken rock broken stones crush crushed crushed rock desktop disposal garbage gravel heap pebble pebbles pile recycle recycling rocks rubbish scrap stones structure structures textures wallpaper angled angles appearance color colorful colour colourful Designs detailed detailing distinctive footpath grooved ground non-slip path pavement paving shaped shapes stonework surfaces textured below beneath bridge deck light lower lower-deck perspectives piers pillars reflections secure solid steel strength strong surfaced thick under undercover water aged crack cracked cracking cracks damage damaged deteriorated deterioration fluted fluting garden garden-pillar lines mini-garden-pillar pillar pot-pillar style surfacing uneven variations varied various activities architectural architecture built city skate park facilities facility outdoor activities outdoor sport provision recreation safety skate boarding skate boarding park skate boards slopes sloping structured youth