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.
Consult your color wheel to choose an appropriate color scheme. Keep the colors in the same family unless your theme is rainbow. Sometimes contrast looks awesome. For instance a brightly colored, woven bohemian blanket would pop nicely against a modern, stark white couch.
Lighting is quite simple sort but it doesn't stop there. You should be thinking about furniture as part of your living room ideas. You can change a lot of furniture but that really isn't necessary. Just by moving a few items that you already have should do the trick.
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