Mary Stella, I am glad to have encouraged you to create your own shady nook, the plants you mentioned are great, also try Japanese Painted fern, Virginia Bluebells, Large-flowered Bellwort, Goats Beard, Brunner Jack Frost, there are many kinds and sizes of Campanulas, Astilbes, and the list goes on. Google plants for moist shade and I bet there are many that you could use. I have 2 Monkshood plants in one of my nooks that get afternoon sun and they blooms quite well, also gives height to the bed. Good luck with your project, when your finished be sure and post photos here.
Frilly, I would not use anything that is considered a groundcover or anything creeping, too much maintenance trying to keep it from invading the other plants or taking over the whole area..
