Should 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 elect to do an around-the-world theme in your living room; this is like a miniature version of Disney's Epcot. You might incorporate Asian tropic samurai, plants and dragons swords that would incorporate all three themes. The idea is, regardless of the themes, you can find common ground found.