Lamium maculatum 'Purple Dragon' displays not only silvery foliage, but also light purple flowers.
Also known as "deadnettle," this perennial ground cover bears an attractive variegated foliage. While the deadnettle in the picture above bears purple flowers, other deadnettles have white or yellow blooms. Lamium maculatum is generally grown for its foliage, however, not its flowers. Deer-resistant, Lamium maculatum is slightly invasive.