go to some thrift stores, find some cheap furniture and spray paint it colors you love...I particularly love doing dressers just because they also give storage space. You can spray paint anything...save your tin cans, take off the labels and paint them, use a sharpie to label them and they become pen holders, kitchen utensil holders, vases etc...can also do to bottles (wine is awesome). You can spray adhesive spray on a canvas and attach a piece of discounted fabric for instant art, which also adds color to the walls, if you are handy you can make a wood frame of 1" X 2" pine boards and "stretch" the fabric around it and staple...that will give you giant canvases of fabric on the walls. Dont be afraid to use sheets for curtains, they have some lovely colors....and check out the shower curtains too!