Nothing helps accent a cool shady spot like the feathery foliage of ferns.
Autumn fern is a slow grower, only reaching 18-24 inches tall, and clumping 24 inches wide, though it has the ability to spread over time by short creeping rhizomes.
It likes even moisture, and full shade.
New leaves emerge copper colored then turn green, creating nice two tone contrast.
Hardy in zones 5-8