The blue/green chairs add a nice bit of color to this side area of the house. Stone terrace planted with mazus. You can see the wonderful mondo grass and autumn ferns.
When working in outdoor spaces, you have a little more leeway mixing greens based on nature's example. For instance, in this garden, the yellow-toned autumn ferns are surrounded by true green and blue-toned greens. The scheme works because it is balanced by the light-colored trees in the background and the grass between the pavers.