Acanthus mollis 'Tasmanian Angel'
Bear's Breeches, Variegated
Acer circinatum 'Little Gem'
Maple, Dwarf Vine
Actaea japonica
Bugbane
Astilbe c. 'Superba'
False Spirea
Astilbe j. 'Montgomery'
False Spirea
Athyrium augustum forma rubellum 'Lady in Red'
Lady in Red
Athyrium filix-femina 'Vernoniae Cristatum'
Lady Fern, Miss Vernon's Crested
Chasmanthium latifolium
Northern Sea Oats
Coleus will work during the summer months but will have to be taken in during the rest of the year. They will not take temperatures below 55 degrees farinheit.
Darmera peltatum
Umbrella
plantDryopteris affinis 'Stableri'
Male Fern, Narrow Leaf Golden-Scaled
Spurge
Helleborus x hybridus
Lenten
roseHosta
Lamiastrum 'Herman's Pride'
False Lamium
Liriope muscari 'Big Blue'
lily-turf
This isn't a complete list but it is a start. Hopefully it will at least get you on the right start. I didn't know your
zone so you will have to check that before choosing to buy one.