Color can establish a focal point or create interest where there is none. For instance, a perfectly square room can be made more interesting by painting one wall in an accent color. Using the same color or a slightly different shade of the same color will have a unifying effect. A dark color paint on a high ceiling will make it seem lower. An exaggerated roof will be minimized with a dark color.
Color can alter the proportions of a room.
A long, narrow room can be made to appear wider by painting both shorter walls a darker color than the longer walls. The process of selecting a color scheme for your home is a personal matter. There are no strict rules governing the selection of a color scheme, but there are some harmonious combinations inspired by the color wheel. The monochromatic color scheme is a popular one today because, by using various intensities of one color, it lends continuity and spaciousness to small or crowded spaces. It is one of the simplest schemes to use, yet it can produce very sophisticated results.