Here grasses lend a very different geometry, rounded mounds, as well as an unexpected silver-green color. Huettl Landscape Architecture used Festuca 'Elijah blue' in the foreground with Blue Oat Grass and Berkeley sedge beyond the gravel oval.
DIY - Homemade Gabion wall ie rocks encased in wire baskets and used as a retaining wall - creates a dramatic feature in a garden. No directions on link. Nice someone figured out how to landscape with river rock. I swear they grow!