We've seen lots of different versions of Hey Diddle Diddle nursery artwork and decor over the years. Some are nice, but some are downright cheesy. If you're looking for the best, most timeless Hey Diddle Diddle images to incorporate into a nursery, there really is no substitute for Randolph Caldecott's.
Originally printed in 1882 with engraved wood blocks, Caldecott's illustrations are now in the public domain. The color and detail are absolutely stunning, and you can download high resolution images from The Library of Congress via Wikimedia Commons right here. They don't call it a Caldecott Medal for nothing, you know.