background decay grunge industrial metal oxide oxidized rust surface texture aged copper patina weathered abstract appearance blended bubbles bubbly circles circular color colored colors colour coloured colours dark decorative design detailed details green interconnected interlinked interwoven light liquid liquidy merge merged merging molten patterns perspectives rounded shape shaped shapes style surfaces textured textures thick thin transparency transparent vibrant wallpaper brown dirty grungy rusty bark cracked cracks fissures hard palm protective rough tree anti-slipping embedded pavement pavement grips paving round safety shiny speckled squares steel coarse diamond plate diamondplate iron non skid plate San Francisco sidewalk urban concrete grow moss nature organic plant black cool curved curves glass glassy lighting linear lined lines mosaic pink plastic star kaleidoscopic metallic rows silver silvery starfish symmetrical symmetry