backdrop background beach circle clam coast coastal mollusk natural nature relaxing rock row sand shell shore spa stress-free summer swirl symmetry vacation wallpaper algae bladderwrack brown coastline exposed green Lofoten Islands low mountains norway norwegian ocean orange plants rocks sea seaweed tide water weed blue rockpools strata cliff Cornish cornwall England english Great Britain ridges sandy seaside surf waves littoral olive Pembrokeshire plant slimy texture united kingdom wales welsh face flower flowering plant groundcover herb meadow petal purple Terrestrial plant thyme Thymus serpyllum wild animals Balanus barnacles creature crustacea marine Mollusca mussels Myrtilus sealife black brooding dark granite granitic rocky stones view grass gray grey hills islands mysterious northern peaks remote misty