Thanks to @littlelibraryguy for the tip on this one. The VICTORY HEIGHTS Free Little Art Gallery in Seattle is a new-ish transplant of the former Wallingford gallery. If you’re in the area, please stop by, peruse the free art, and bring home a treasure, or leave something for someone else to love!
The curator asks that if you want to mail art, query first via DM.
I do wish people would let me know when they move their galleries so I can update the map — and announce the new location here.