For those living in an apartment or wanting temporary wall coverings, we all know the biggest impact comes from color so go ahead and paint an accent wall, as done here:
( just be ready to repaint it back to it's original color before you move out, If that's your rental management's request). But you can also go another route by using fabric or sheets as wall coverings. Using nothing more than some beautiful fabric(cottons work best) or sheets.a good plumb line, fabric cutter ruler and liquid starch.
Let me forewarn you this can be a little messy going up but once done can have a huge impact and it's easy peasy to take down. this technique does not work however in rooms where there is a lot of moisture like bathrooms, so any entry, bedroom or living space would be your best option. HGTV does a great job of explaining how to do this, click on this link : http://www.hgtv.com/decorating-basics/how-to-install-a-fabric-feature-wall/page-2.html for more details.