abstract art background brown closeup color design granite grunge macro natural stone texture erosion layers nature rock rock face sediments Zion National Park forest mountains pebbles river rocks stones stream walls coastline flowers hillside old red scene valerian view wales wall water welsh wild garden green halophyte leaves plant pointed rosette sharp spotted succulent xerophyte xerophytic Anthus petrosus bird Cornish cornwall England english feeding Great Britain rock pipit Corydalis fumitory summer wiltshire yellow flower spike spines swirl backdrop black concrete gray grungy natural texture pattern textured urban