They are magical illusions of nature. Sky ceilings make it seem that a bathroom ceiling is made of glass. You see it there with beautiful clouds and a few tree branches. Just flip the light switch and you've got it. Visit www.theskyfactory.com for some examples.
Ceilings full of clouds are part of today's technology, which brings large-scale authentic photographs into the home. Fake skylights that mimic the real sky can transform a dark room into a bright sunroom, complete with light and clouds. Authentic illustrations of real skies transform the interiors of confined spaces. 
How about the floor? When you open the door to the guest bathroom, a photographic floor can make you think you are stepping into Lake Michigan and looking toward the Chicago skyline. Many such experiences are offered at www.printedspace.com.
Greatwallonline.com offers custom wall coverings with images of skylines, red-rock canyons and forested Northwestern mountains shrouded in mist.
It's not just walls and floors that are going photographic, www.haute-house.com can cover sofas, chairs and pillows with maps, scenery, old photos or family portraits.
Photographs can be reproduced on leather. Any graphic or any color can be printed on leather by SIF Technology Digital Leather. To see the results, visit www.digitalleather.com.
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Gabe, thanks for the links to each of these ideas. I am off on a tangent to visit each of them now. Just suggested this as a Feature, it deserves it.