Heuchera will go with so many plants...if for shadier location, maybe lady's mantle, siberian bugloss, 'cascading' type grass like japanese forest grass, creeping jenny, hosta, ferns (I love Maidenhair and Japanese painted and Ghost fern), and for something taller solomon's seal... For sunnier location you still could use heuchera, even with lamb's ear - and just about any other perennial or annual will go with lamb's ear. Cabbages would look good with it too. Or you can create more monochromatic container with other silvery plants (artemisia, dusty miller, licorice plant, silver sage, blue fescue...) I would plant euphorbia 'Diamond frost' in that container too...Rina

Full shade or light shade? If light shade (or reflected light), you are not very limited. You can select from a variety of hardy, mostly evergreen perennials (euphorbias, heucheras, bergenia, small evergreen grasses) groundcovers and seasonal annual-type plants like pansies, mums, dusty miller and ornamental cabbages and kale.

I gently massaged the leaves; the dead ones crushed and became mulch and the live ones were left. It probably will take a few attempts before it looks good. But after all, it snowed here today and your zone is about a month later than mine. :)

Are you familiar with Deborah Silver who used to own Detroit Garden Works and writes the blog Dirt Simple? She does stunning containers for all seasons. https://deborahsilver.com/blog/ If you can find ornamental kale or cabbage consider a combo with a center gathered tuft of branches that can stay for the winter arrangement.