Caryopteris can be grown singly, in multiples, or as a long hedge for maximum impact.
In my Midwestern garden amsonia's yellow foliage (not shown in this picture) is a welcome accent in the late autumn landscape.
Perovskia has a handsome branching habit and looks airy with small grey leaves in spring, blue flowers in summer, and white skeletal branches in fall & winter.
Thyme is an herb of the mint family well known for its culinary uses. However, there are about 350 other species of thyme, each uniquely beautiful.