Here's an old favorite of mine. When it comes to concept art, Imagineer Herb Ryman was one of the first and best. The first to do Disneyland at the request of Walt Disney himself and his go-to man for the most elegant of renderings for the incredible, original EPCOT Center. Nowadays, only the premier projects get beautiful pieces like this. It's really too bad.
I left this one large for a good reason- just click.
(Art copyright The Walt Disney Company.)