If you want to make your decor unique, don't go the standard "couch, tv, white wall" routine. Instead try something different such as bean bags chair (there are few different types), big art center piece instead of tv, art works, unique wall color or decor, and other things.
Also you'd be amazed by how big of a difference lighting can make. So be sure to have few lamps with different lights (some more bright, other dim, etc...)
May find something to revolve the idea around?
At my old place, I revolve my room around movie 300. I have the wall painted light grey, bright red curtain, bright red bed sheets and blankets, black and white photographs on the wall, and dark wood shelves. The light was sorta dim and have more yellowish tint to it to make the room look like as if it was lit by a torch.
A friend of mine did burlesque/pin up theme, she have funky colorful couch that she re holstered, coffee table matted with various pin up girls picture, furniture from 40s or 50s, and other things.
