Beach Bungalow 8 nailed it with her use of Imperial Trellis.
Just a punch on the accent wall paired with the dark wood floors and the killer blue wall. (Find the chairs pictured above here, at West Elm.)
Now, it's true, this wallpaper will cost you an arm and a leg. If you are as ambitious as Hello Gorgeous you can try to stencil your own imperial trellis.
Check out her stencil templates and her how-to directions here
The finished product