Singer Nat King Cole was born on this day in 1919, and just as his songs were unforgettable and created moods, so do the colors you choose to use in a room for walls, drapes, furniture and carpets. For example, red increases tension and raises blood pressure, making it exciting. Just a touch of red makes it warm and inviting. Conversely, blue lowers blood pressure, eases tension and makes a room tranquil, but too much blue can be depressing. Yellow is bright, cheery and promotes efficiency. Orange offers the best of both red and yellow; but if it's too intense it physically tires you. Purple creates elegance, but too dark or too bright tones of it create headaches. White reflects the most light and causes eyestrain. Black promotes moodiness, so use it sparingly. Gray or beige needs bright accents for balance. Finally there's green. Normally a fresh and restful color except for today -- St. Patrick's Day. And that's the On The House tip for today.