I recently bought the LOTR 4K set, which comes with a terrible case, so I was on the hunt for custom cover art to upgrade with and stumbled across this site. Someone created great covers based on the art by Juan Estebon, which is my favorite LOTR artwork and have all 3 hanging on my wall. The covers just look fantastic.
I've lost a lot of time in my day already just poking around and looking at everything people have contributed.