There are tons of papers available that would go with your midcentury home. Many people tire of a paper quicker than they are ready to redecorate and they can also look dated in a couple of years. Metallic papers were big im midcentury...perhaps a metallic silver paper? Are you also considering paint? You can get it in so many textures and a blue wall to match the blue in your loveseat would be lovely with some midcentury art and sculpture, or photographs on it. A mirrored wall with or without art or sculpture would also work with midcentury. These treatments are easier to adapt should you wish to change the look slightly from time to time. I would suggest replacing your stairrail with chrome or acrylic if that is in the budget...see how well the loveseat frame looks with the fabric? I hope you will post the "after" photos for us to see. Above all, enjoy the process!

I found some cool diamond patterns, but nothing quite like the black and white example you provided: Also, while searching I found this totally awesome concept: Were you able to find a wallpaper like the one you provided?

Here it is (but I'm guessing it will be available from more places): http://muralunique.com/index.php?route=product/product&path=53_56_77&product_id=937&sort=p.price&order=DESC

I'm sure there's a lot of information out there thanks to a quick Google.