The more themes you incorporate, the more creative you should be but the process is basically the same. It will likewise depend how similar or different the themes are. Combining some themes like an Asian theme and Zen theme would be easier than a Zen theme with a rock-star theme. The primary task this is to identify the common element 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 method of feng shui. You could also incorporate meditation cushions that would be used in Zen lifestyle and simultaneously represents a classic Asian seating arrangement.