I usually end up using Monet and Klimt landscapes at the setting and then swipe figures from all sorts of art to populate them. There are a few exceptions, like the O'Keeffe surrounding the Spirit cut out, which is a combination of two different art works: an 18th century dress and a bust, both from the Met.
Basically, I have a HUGE supply of old calendar materials and I'm playing around with them as a way of relaxing. I've sold a few at my art show that just closed.