There are so many tricks to play when decorating your rooms. For example, if you are trying to make your rooms seem more spacious, consider the following points:
Color: Use monochromatic color schemes, such as cream, beige, gray or cool pastels on your walls and floors to make them recede. The ceiling should always be the lightest color in the room. See this article for more color influence.
Textures: Avoid heavy textures when choosing rugs, carpet, furniture and draperies. Smoother surfaces tend to reflect more light and make the room feel larger. Choose tile over patterned or textured carpeting.
Patterns: Limit the use of patterns in the room to create a more airy feeling. If you have a favorite pattern consider using it as an accent piece; pillows, lampshades, and such are a good choice.