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Speaking about color, there is Salvia with silver foliage as Salvia Argentea an Salvia Discolor.

Salvia Argentea is a short-lived perennial that forms large clumps of soft, felty-grey leaves around the base of the plant. Spikes of hooded, two-lipped, white or pinkish-white flowers are borne in mid and late summer, on strong, upright stems. Suits a Mediterranean style border, but will need shelter in areas with cold winters.

Argentea Sage grows in light, very well-drained soil, in a warm, sunny site. Use a cloche or glass panel to protect from excessive winter wet and cold winds.

Another species of Salvia valued for both its flowers and silver foliage is Salvia Discolor. It’s an upright, herbaceous perennial, which is normally treated as a summer annual in cool climates. Salvia Discolor’s green leaves have a densely white-woolly surface, forming an unusual display in themselves until the long spikes of deep purplish-black flowers extend above them in late summer and early autumn.

Salvia Discolor thrives in light, moderately fertile, moist but well-drained, humus-rich soil. It will love its position in full sun or light shade.