Kitty,
Here is some more information on the painter of the Riverton mural which I found on another board:
"I have done a bit of research on the artist, George Vander Sluis, who died about 1984, he taught at Syracuse University and had an interesting life it looks like, apparently unmarried, he painted a lot of barns in New England. The mural was part of a WPA project that began in the depression. What is so errie for me is this would have been created about the time the characters were born, and those hats...."