House Beautiful recommends painting a bedroom in a monochromatic theme, including the trim, to make the room appear larger. Blue, white and gray are colors that can work to enhance the illusion of extra space in small rooms.
To make a small bedroom appear larger, choose lighter colors for ceilings and floors and cool paint colors for walls. Use colors that match the furnishings in the room to promote an open appearance in the room. In bedrooms with natural wood furnishings, such as mahogany or pine, opt for paint colors that blend well such as warm colors for dark furnishings and cool colors for lighter-colored furnishings.
Choose paint colors that blend well with other elements in the room, such as artwork or lamps, to prevent one piece from making the room appear small. For example, a large, brightly colored painting in a room with dark walls may make the room feel smaller.
To add style to a room that is designed in a monochromatic theme, choose slightly different shades of the same color. True Value recommends using colors with the same saturation level, or brightness, if a variety of colors is desired in a small space. Eggshell blue and pale lilac have the same saturation, or brightness, levels, for example. Another option is to paint two opposing walls dark colors, and leave the two remaining walls white to create the illusion of depth and space in the room.