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.
The color palate of the room is another helpful tool to blend different living room ideas. Even if the décor dramatically contrasts in concept, you can get away with it if the colors blend. If you are determined to have your sports fan décor in your wife's traditional living room, color mediation is a solution. You could tone down the bright colors of a Lakers helmet by using a vintage display case. You could also print pictures in black and white or sepia prints to intertwine the two themes.
Don't let the living room ideas stop there... you now need to think about the furniture. You don't have to go out and buy new furniture; you can make use of what you have. This is your time to be creative. Start moving things around or think about painting walls.
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