Dollar for dollar, painting is the most cost-effective way to update your place. But if you're nervous about the effort or cost of painting a whole room, just paint one wall (like along a hallway or behind your bed). Instead of $70 for two cans of paint, you can buy a quart (which covers up to 100 sq. ft.) or a 2.5 liter can (which covers up to 260 sq. ft.). Just enough to change a single wall, which will make a bold impact in any room. Smaller rooms like a bathroom or kitchen can be transformed with the addition of a little color on the walls.