Warm Colors

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  Warm colors, including all variations of red, orange and yellow, may produce intense feelings from anger and hostility to warmth and comfort. A room painted in the color red might raise blood pressure and make the heart beat faster. In some, the color red evokes anger or displeasure. Orange, a slightly richer warm color, can produce feelings of increased energy and enthusiasm. If you're trying to get someone's attention, orange is the color to use. While yellow is generally considered to be a cheerful color, when put in yellow rooms, babies tend to cry more and adults tend lose their temper. Yellow can increase metabolism, and it draws the most attention of all the colors.
  
  

Cool Colors

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  Cool colors, including purple, blue and green, are generally thought to be calming colors. However, these can also induce sadness and depression. The color purple can bring about feelings of creativity and depth. It has long been used to represent royalty. Blue, outside of causing sadness in some, has some definite positive effects on the body. It can lower blood pressure, heart rate and temperature. Green calms, soothes and is often said to have healing powers. Those who work in green offices experience fewer stomach aches.
  
  

Black and White

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  Black absorbs all light and color. Some people experience feelings of dread around the color black, since it is often associated with darkness, evil and death. White is often associated with feelings of cold and sterility. While it might cause a space to feel larger and more open, it can also evoke feelings of emptiness and unfriendliness.