The National Gallery of London site has a set of 256 gorgeous zoomable paintings. Alas, the Gallery has in recent years taken to plastering its name in multiple places on each work of art. And yet some pictures are so wonderful that their beauty shows through nonetheless.
One of these is --
I discovered the Pueblo artist Awa Tsireh (1895-1955) on the Internet and was immediately attracted to his work. The Smithsonian American Art Museum (SAAM) has 51 of his watercolors. Take a look and see if they hold the same charm for you as they do for me.