In design there are five basic principles you should follow in developing your living or working space:
Space – is the first element and most important. You should think about how much do I have to work with?
Lines – can have a huge effect on the overall feel of the room. Vertical lines add height and prestige. Horizontal lines create an intimate, relaxing and informal atmosphere.
Form – is a shape or combination of shapes of the elements in a room. For example, if you have square windows, window treatments can lengthen them and give them a taller rectangular look.
Color – is the most significant mood determining element in a room. It intensifies as you increase the area of coverage.
Texture – is great for adding interest to a room.