The silvery foliage of dusty miller plants is used in this example to soften a cobblestone path.
The hard edges of this cobblestone path are softened not only by the presence of plants, but by color selection.
The cobblestone path here is visually more interesting than the pavement pathway in the prior picture. But even for such an attractive pathway, the "rough edges" can stand to be softened up somehow. Otherwise, the cobblestone path would be perceived as too stark against the grass -- almost as if it had "imposed" itself on the lawn. But with the plantings of dusty miller and begonias, it seems to blend in better. Any plantings would have been better than nothing. But in this case, the dusty miller seems to work especially well. Its silvery foliage picks up the color of the cobblestone path, thereby further softening its edges.