seamless grey, black and white pebble pattern or tile river stone background

rock iron food soil pebble wood stonewall boulder geology sand gravel flooring art produce rubble brown baking stone pattern background abstract design textured seamless texture floor repeat surface wallpaper shape beach marble material smooth nature print round tile white paving wall river sea summer graphic grey mosaic rough fabric modern pavement cobble cobblestone decorative coast natural colours monochrome endless tiling black