Coloured stone materials for use in paving; concrete paving blocks; concrete paving elements; concrete paving stones; decorative paving stones; non-metallic composite structures for paving of surfaces; non-metallic materials for use in paving; non-metallic paving materials; non-metallic paving products; paving blocks made of non-metallic materials; paving blocks, not of metal; paving made of non-metallic materials; paving non-metallic materials; paving slabs, not of metal; paving stones; path edgings made of non-metallic materials; stair-treads (steps), not of metal