Not only are Cranesbill easy to grow, some of them are as blue as the Meconopsis and outbloom them. Rozanne, for example, produces flowers in November. Meconopsis gives up by the end of May.
Lily of the Valley, Sweet Woodruff, Iris (all of them), Lamium, Mondo grass and Perinwinkle: They do fine in the Pacific Northwest. Periwinkle is another terrific, low maintenance, ground cover with true blue flowers. They look very good next to the Gunnera (Dinosaur Food) M.
Hello, again, Jennifer! I did have good luck with one Cranesbill called 'Splish Splash.' I grow all the other varieties you mention, except for Gunnera, which is not hardy in our Zone 5a garden. I have the perfect spot for it, if only I were in a warmer zone...(sigh). Best--Larry☼