This is a living room. Red is the main color that i choose, I mix it with the white color.

Well, i must admit it. I cannot make an impression from my design :"(
I just follow my instinct, whether this color is suit (with the furniture, wall, floor, and the type of the design itself) or not. If it doesn't suit, I'll look for another creation.
Besides, i only have The Sims 3 master (I'm not expand it yet) so the furniture still  not a lot and rather ordinary.