I'm not positive on this but I would try art museums or the catalog that sells books, puzzles, posters, etc of art. I don't think I can name it on this site but they also sell little sticker books puzzles, etc for children on racks for $1.50 You can find them on line too if you search art stickers. They have lots of inexpensive things you can decorate with. You can also buy used books and cut out the pictures.