Decor it Yourself.
tutorial, and it only uses thumbtacks & yarn!
There you have it! A little inspiration for the weekend. Look around you and see where you can cram some art, and let your creativity do the rest. There are so many different shapes and patterns you can do, from geometric, to random, to actual shapes. Seriously, do some google image searching and you'll see things range from stars and flowers, to owls and people's silhouettes. Wild stuff. Have a great weekend!