Painting a room different colors
Does the sun shine in through the window or is this a North window exposre?
If you have direct sun shining in, stick with lighter colors on the window side and darker on the walls that receive direct sun light. Keep in mind, that each of the walls that the sun shines along(not directly on), will highlight many imperfections, like poor taping and sanding prior to painting.
TIP: After sundown, try holding a flashlight along the walls that are perpendicular to the sunshine or walls that will be lit with sconce lights, before you paint. This light will expose obvious imperfections before you choose to paint. Flat paint will help hide more imperfections than low luster/satin or semi-gloss paints. As for the colors chosen, try complementary colors that can be used together in a "wash", rag rolled or sponge application upon the largest wall as a compromiseing effect.