The more themes you incorporate, the more creative you will need to be but the procedure is basically the same. It is going to depend how similar or different the themes are. Combining some themes as an Asian theme and Zen theme will be easier than a Zen theme with a rock-star theme. The primary task this is to identify the common factor in the living room ideas. For instance, in combing an Asian and Zen theme, you might incorporate a more natural Asian representation like bamboo, jade and the very idea of feng shui. You may also incorporate meditation cushions that would be used in Zen lifestyle and simultaneously represents a classic Asian seating arrangement.