A couple of months ago I noticed there was an auction of Sci-Fi related material in London. The catalogue was amazing! The original Leela costume from Doctor Who, costumes from Star Trek, gizmos from Blade Runner - and a whole bunch of Star Wars props!
Sadly, I couldn't afford the original pieces of the Death Star (expected price of £10k-20k) nor the Millennium Falcon blueprints (a more reasonable £1k). I made do with scraping the images out of the catalogue.
Here are all the gorgeous art works that I could find from A New Hope, "Chapter II", and "Blue Harvest".