Will you be painting in order to sell your home? If so, I expect your objective is to make the job attractive to as many potential buyers as possible. As an ASP (accredited staging professional), my first recommendation would be to paint all four walls the same color. Accent walls generally look 1990s-dated. Bring in an element of color in one or two pillows, or have a dominant color in your artwork. Now, as for WHAT color? A neutral blue-gray is very effective, because it is visualized as more blue for those who love blue, and more gray for those who want something more neutral. Go do a few chin-ups to improve your upper arm strength -- and get to painting!