abstract angled angles appearance background blocks bricks color colorful colour colourful Designs detailed detailing distinctive fit fitted fitting footpath grooves ground interlock interlocked interlocking level light path pattern patterned patterns pavement pavers paving paving-bricks rough shaped shapes smooth stones stonework surface surfaces textured textures concrete crazy-paving gaps haphazard hard-surface hard-surfacing irregular mortar outdoors size Sizes striations uneven