Paint can change the look of a room from formal to casual, from serious to whimsical, from mature to youthful.  It is part of the magic that an interior designer manifests in creating a room’s appearance. Paint color can define spaces, designating distinct areas without having to build walls. It can also create interest in its placement, moving the observer’s eye from one wall to another. It can create a mood, an ambience, a style.

For instance, were all the walls in a room painted stark (decorator’s) white, it would evoke a spare, minimalist feeling. For an overall clean and larger look to a room, paint the ceiling the same color as the walls. For drama, and to correct the size imbalance of a room, paint the longer wall a color and, for some drama, the ceiling as well. If the ceilings are too high, paint them the same color as the floor, if too low, paint the ceiling out by using the same color on the ceiling as used on the walls.

In terms of finish, what should be taken into account is the condition of the walls. A flat finish will absorb the light, yet show fewer imperfections. Thus, it is a perfect choice for the ceiling. Walls usually require an eggshell finish, that is more easily cleanable. And, woodwork most commonly requires a satin finish, easy to maintain. 

Trick - If you have a lot of soffits or eaves in the ceiling and want to streamline the room, paint them out - paint them all the same color as the wall or ceiling to which they are attached.