William Morris Honeysuckle design - probably killed thousands with arsenic in the green pigment. Disclaimers were made of the poisonous substance, but many were so caught up in the luxury of the color that they didn't seem to care.
Macaw wallpaper by Walter Crane, I include Walter Crane on William Morris board because this was a design created by Crane, but produced by Morris. The caption attached to the image states, this is "Macaw" by Walter Crane
Delectably Danish: The Scandic aesthetic is turned on its head