"The music is not in the notes, but in the silence between" ~Wolfgang Amadeus Mozart~
Harmony should be a guiding principle of your design. Just as fire, earth, water and air are needed elements for balance of life, so are the elements of proportion, balance, color, and scale needed to find a harmonious effect in design. A mix of texture, large and small, neutral color and warm color, are all needed to bring a totality of harmony to your environment. And sometimes, what you leave out is just as important as what you put in. Learn to step back and take a look with an objective eye. Allow the notes of a room to sing, and also listen to what the room is trying to tell you. And remember, you may be the most important note of all.