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!

It's refreshing to see nautical, navy BLUE. Everyone is saying the same thing for the most part - just introduce another color, definitely bright (yellow or orange IMO) and it will make it more current. What I really like is how your style will withstand the test of time - and with minor updates now and then it will always look fresh and "current".

Is this the couch ? https://www.google.com/search?q=Frank+Underwood%27s+office&client=firefox-a&hs=490&rls=org.mozilla:en-US:official&channel=fflb&tbm=isch&tbo=u&source=univ&sa=X&ei=SyjXU5b6LKTf8AH2uoDICg&ved=0CB4QsAQ&biw=1184&bih=597#facrc=_&imgrc=OV2VuYFL2Xn11M%253A%3BDhS_QaDxl6uHDM%3Bhttp%253A%252F%252Fwww.centsationalgirl.com%252Fwp-content%252Fuploads%252F2014%252F03%252Ffrank-underwood-office.jpg%3Bhttp%253A%252F%252Fwww.centsationalgirl.com%252F2014%252F03%252Finteriors-in-house-of-cards%252F%3B606%3B413

The blue is awesome (grey is too trendy)! The reason it stands out to you is perhaps because it's the only real colour there. Bring in the blue in a window treatment, a small appliance that sits on the counter, a pretty tray or area rug. Also, it is more appealing often if there are more than 2 colours - so right now you have a white and blue colour scheme - bring in red or orange or fushia - something from the other side of the spectrum (like you did with the yellow flowers but in a more permanent way)!