If your chosen themes accommodate one another, you can create a unifying theme. Consider this: your spouse wants an Asian theme, your teenage daughter wants a gothic theme and you want a tropical theme. In such varied combination you may decide to do an around-the-world theme in your living room; this is like a miniature version of Disney's Epcot. You could incorporate Asian tropic plants, dragons and samurai swords that would incorporate all three themes. The point is, regardless of the themes, there is common ground to be found.
Having said that if you do have the money to purchase some new furniture then that is a lot more fun. It is important to set a budget though prior to looking as you know what it is like when you are out shopping and you get carried away with what you see.
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.
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