If you are going out to buy new things then that is a lot more fun. Try to do a bit of research first to find out what styles you like and the types of prices that you will have to pay. This will put you in a much better position when it comes to negotiating.
Lamp shades are a great way of influencing light if you already have the right light fittings. You don't need to buy expensive lamp shades, just think about the likely effect on the room and make your decision from there.
The more themes you incorporate, the more creative you will have to be but the process is basically the same. It will also 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 here is to identify the common factor in the living room ideas. For instance, in combing an Asian and Zen theme, you would incorporate a more natural Asian representation like bamboo, jade and the concept of feng shui. You could also incorporate meditation cushions that would be used in Zen lifestyle and simultaneously represents a classic Asian seating arrangement.
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