The Process. Choose a Color Scheme. Go into a decorating project with a color scheme in mind, but allow for some flexibility. For example, you may find a blue rug with green accents that you love, but you had it in your mind to use yellow as an accent. A rug can be a major component of a room, so you may have to ask yourself if you want to alter your original ideas to incorporate this rug. Learn more about choosing a color scheme.