The first step in determining the colour scheme of a room you want to change is to examine the existing furniture, window treatments, and other accessories (or shop for these items first). Choose your favourite colour in these items and then go to your local paint supplier to get colour chips in complimentary colours. Look at the chips both in the daylight and at night so you can see how lighting will affect the colour. As a last resort, you might want to buy a sample pot of your chosen colour and test it on one wall.