beach coast coastline color colored colors colour coloured colours layers levels ocean pebbles rocks rocky rough sand sea seashore seaside shade shadows shapes shore shoreline Sizes stones stony sunlight sunshine variety water beautiful beauty blue boulder clear cool granite holiday inviting islands lagoon Maddalena mediterranean natural nature refreshing ripple rock Sardinia summer vacation wave ship bleached branch coastal contrast debris driftwood evening high tide log low tide scene simple stick stone sun tide tree weathered white wood