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

rock soil wood stonewall pebble food sand gravel boulder flooring geology rubble iron produce brown cobblestone asphalt 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 decorative coast natural colours monochrome art endless tiling black background