Nepeta is a good one. Some sedums, salvias, certain monarda cultivars.
Here are some cultivar examples for some ideas. There are lots more out there that could work for you but this is just a sampling to give you some ideas.
Nepeta: Walker's Low, Snowflake
Echinacea purpurea: Pow Wow Wildberry, Pow Wow White
Coreopsis: Galaxy, Sweet Dreams
Sedum: Moonlight Serenade, Autumn Joy
Veronica: Icicle, Red Fox
Monarda: Grand Mum, Cranberry Lace
