Grisaille: a French term for a painting done in monochrome: generally in shades of brown or gray. These wallpaper panels in the 18th century section of the Louvre's Musee des Arts Decoratifs fit the bill nicely. These are obviously LATE 18th century as they are done in a neoclassical style that crossed over into the early 19th century.
I hope everyone has a relaxing early holiday weekend and stays warm! Winter is here (or at least it feels like it!).