Blue Lyme Grass, Leymus arenarius; zone: 3-9, 23-35" tall, spreads rapidly. "Grown for its display of exceptionally beautiful steel-blue foliage, this is a spreading grass that needs to be used carefully. Very drought tolerant. Keep this out of the perennial border!!" ...and yet so tempted to use it in front. Maybe in sunken containers?
Variegated Moor Grass - Highly ornamental grass for use in perennial borders. Green blades striped with creamy white continues a colorful display through summer, perfect for edging or groundcover. Herbaceous perennial.
Black Mondo Grass - Sun or deep shade - 1/2' tall x 2' wide - evergreen - water tolerant - Black mondo grass is a wonderful accent plant, setting off lighter plants, such as snowdrops. It shows up well against pavers or stones and looks great edging the rim of a container. With time, and in rich, moisture-retentive soil, it forms a thick groundcover. GREAT PLANT PICK