If you're looking to repaint but you just aren't sure about your colour choices, make your own sample boards of colour. Simply purchase white bristol board, inexpensive rollers or brushes, and sample pots of paint, found at most popular paint retailers. Samples are available in thousands of colours!
You can either cut the bristol board in half, quarters, or use an entire piece for each colour you are trying. Prime the boards with a simple multi-purpose primer and apply 2 coats of paint. If you choose not to prime, apply at least 3 coats of paint to your board to ensure you see a true representation of the colour. Remember, if you will be comparing to another wall colour, leave a few inches of white around the entire perimeter of the board so you will not be comparing your new colour with the colour that is currently on your wall.
Now place your sample boards in the rooms you would like to paint the corresponding colours in. Look at them for a few days and notice how the colour changes during different times of the day and how lighting affects the way the colour looks from wall to wall. REMEMBER: It's imperative that your wall colour works with the colours that are existing in your room. Furnishings, textiles, and fixed elements such as tiles and carpeting must all work together with your wall colour, if you want the room to look cohesive.
Now it's time to decide whether or not you want to use the colour in your space. If you love it, the decision is simple. If you don't..., you just saved yourself a lot of time, money and disappointment!