First, when buying new upholstered furniture, particularly the largest and most expensive pieces (such as the sofa) stay with neutrals. That means not only a neutral fabric, but also a neutral style. Neutral doesn't have to be borrowing, but it does have to be something that can easily change as your tastes change. So when you want to change from the mod colors above to something a bit more formal and subdued, you can do so without having to spend a fortune on a new sofa.Or in the room below, plan for when the kids get older and their artwork is replaced by something more adult the sofa will still work. Simply change the coffee table and end table for something a bit more sophisticated and you have a new room - with the old sofa!
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And finally, use area rugs to give you the color and texture you need, but don't spend a fortune. That way when it's time for a change in the style of the room, the rug can be a part of that change - and one you won't feel badly about.