Welcome Anne! Couple plants come to mind --
Shade ground covers:
Kinnikinnick (Arctostaphylos uva-ursi) (native to PNW)
Bunchberry (Cornus canadensis) (native to PNW)
Sweet Woodruff (Galium odoratum) (can be aggressive, I've not had a problem with that)
Bishop's Weed (Aegopodium podagraria 'Variegatum') (same as above, many folks actively hate this - I like it)
Kenilworth Ivy (Cymbalaria muralis)
Red Barrenwort (Epimedium alpinum 'Rubrum') (or any of the barrenworts, slow to spread out for me)
Spotted Deadnettle (Lamium maculatum 'White Nancy') (can get away from you, but easy to pull where not wanted)
False Lily of the Valley (Maianthemum dilatatum) (native to PNW)
Dwarf Comfrey (Symphytum grandiflorum)
Creeping Raspberry (Rubus rolfei) (native to PNW)
I'm fortunate to have good soil, but think any of the following would do well in a sunny spot with little supplemental watering:
Renard's Cranesbill (Geranium renardii) (or any other real geranium, this is my favorite)
Sea Thrift (Armeria maritima) (native to PNW)
Strawberry (Fragaria x ananassa 'Pink Panda') (or any ornamental fragaria)
French Lavender (Lavandula dentata) (I struggle with lavender, they like sharp drainage)
Goldenrod (Solidago Little Lemon)
Feverfew (Tanacetum parthenium) (this grows everywhere for me - self sows freely, nice spots of white)
Good luck, and be sure to post pictures of whatever you decide on. We love watching gardens-in-progress.
