Add some green!
Houseplants can really brighten up a room (and your mood). Cacti are about the easiest plants in the world to care for, and most of them are inexpensive. If you’re not a cactus fan, consider a spider plant or “lucky bamboo” (which can be grown in water and isn’t really bamboo at all).
Read more here: How to Decorate Your Apartment on a Budget | eHow.com