If you have blank wall and you want to spruce it up there are always unique ways to do so.
Inspiration Boards - My favorite option is a inspiration board. This works great in a office. Every time you look at it you will feel inspired.
Frames - Frames with picture you have taken or drawings will always give you walls an elegant look.
Wire Wall Grids - This is such a big trend right now. and a wire grid to your wall with your favorite things not only looks great but it also is a great way to organized.
Mirrors - Mirrors can help decorate your space and at the same time make your space look bigger.
Clocks - When in doubt put up a clock, I mean who doesn't need to know the time ?
Art Work - A nice canvas painting will make your space look more expensive than it might actually be and who doesn't want that?