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!

A cool, modern graphic designed runner, new door knobs and a few updated ceiling lights are a great start and easy fix to brighten and update your hallway. Have fun! {PRODUCT LINKS: http://www.atgstores.com/runners/safavieh-dhu554c-21-dhurries-runner-brown-ivory_g1461183.html http://www.atgstores.com/semi-flush-ceiling-lights/vaxcel-cr-cfu130nb-3-light-carlisle-semi-flush-ceiling-light-noble-bronze_g756367.html http://www.atgstores.com/indoor-door-handles/first-watch-security-1140-indoor-glass-knob-set_g806090.html

Some inspiration, the last pic is clever with the bookcase, you would have a lip on the shelves to stop books falling off every time you open the door, but it sure serves two purposes

If you have bare walls, then choose colours that won't clash and would tie in wiht the room. Then pick out colours you actually like and pick a favourite. Most everything will go with Grey but contrast is usually more visually pleasing.