If you think that changing the decoration of a room is costly, think again. Follow these simple steps and change the decoration in less than a day. 1. Paint By painting a room, you can change the decor and atmosphere instantly and at a very low cost. First, choose a color. Color is an important element in our lives. Our personalities can be reflected in our color choices. We use color to visually communicate, convey emotion, express ideas. Here are some examples of how our personalitie.