Colors are more than a combination of red and blue or yellow and black. They are non-verbal communication. Colors have symbolism and color meanings that go beyond ink. Keep in mind how the eye and the mind perceive certain colors and the color meanings we associate with each color.
In Telepress, colour dictates categorisation and order.

The meaning of Red - North West, Social Control

Excitement, energy, passion, desire, speed, strength, power, heat, love, aggression, danger, fire, blood, war, violence, aggression, all things intense and passionate.
Red is intense. This is particularly so when placed against a dark background, and is one of the reasons that I chose it as a design element for this web site, (section dividers). Red is a universal warning colour and is therefore hard to ignore. A little Red goes a long way.
Love and War: Red is hot. It's a strong color that conjures up a range of seemingly conflicting emotions from passionate love to violence and warfare. Red is Cupid and the Devil.Nature of Red: A stimulant, red is the hottest of the warm colors. Studies show that red can have a physical effect, increasing the rate of respiration and raising blood pressure.
The expression seeing red indicates anger and may stem not only from the stimulus of the color but from the natural flush (redness) of the cheeks, a physical reaction to anger, increased blood pressure, or physical exertion.Culture of Red: Red is power, hence the red power tie for business people and the red carpet for celebrities and VIPs (very important people).
Flashing red lights denote danger or emergency. Stop signs and stop lights are red to get the drivers' attention and alert them to the dangers of the intersection.
In some cultures, red denotes purity, joy, and celebration. Red is the color of happiness and prosperity in China and may be used to attract good luck.

The meaning of Yellow - South West, Economics

Joy, happiness, optimism, idealism, imagination, hope, sunshine, summer, gold, philosophy, dishonesty, cowardice, betrayal, jealousy, covetousness, deceit, illness, hazard.
Yellow is the brightest colour. It screams for our attention and this is why warning signs are frequently painted this colour. Yellow and Yellow-Orange also are the dominant colours of Autumn and as such have a strong appeal to our emotions. Psychologically Yellow is a colour denoting happiness.
Hope and Happiness: Yellow is sunshine. It is a warm color that, like red, has conflicting symbolism. On the one hand it denotes happiness and joy but on the other hand yellow is the color of cowardice and deceit.Nature of Yellow: Yellow is one of the warm colors. Because of the high visibility of bright yellow, it is often used for hazard signs and some emergency vehicles. Yellow is cheerful.Culture of Yellow: For years yellow ribbons were worn as a sign of hope as women waited from their men to come marching home from war. Today, they are still used to welcome home loved ones. Its use for hazard signs creates an association between yellow and danger, although not quite as dangerous as red.

The meaning of Green - North East, Political Organisation

Nature, environment, healthy, good luck, renewal, youth, vigor, spring, generosity, fertility, jealousy, inexperience, envy, misfortune.
Green is a second-order colour formed from the mixing of Yellow and Blue. As with Orange it is capable of a wide range of tonalities or shades. Of course Green is the predominant colour of vegetation and as such is dominant in many landscape photographs.
Life and Renewal: Green is life. Abundant in nature, green signifies growth, renewal, health, and environment. On the flip side, green is jealousy or envy (green-eyed monster) and inexperience.Nature of Green: Green is a restful color with some of the same calming attributes of blue. Like blue, time moves faster in a green room.Culture of Green: Green is the national color of Ireland and is strongly associated with that country. Green also has close associations with Islam. Because of all the green in nature the color is reminiscent of Spring. Coupled with red it's a Christmas color.

The meaning of Blue - South East, Education

Peace, tranquility, calm, stability, harmony, unity, trust, truth, confidence, conservatism, security, cleanliness, order, loyalty, sky, water, cold, technology, depression, appetite suppressant.
The sky is Blue, and water is usually Blue, as it derives its colour by reflecting the sky. Blue is the colour which defines our planet. In fact from space Earth is seen as a Blue planet.   
Blue is a retiring colour and conveys a feeling of restfulness and passivity.
Calm and Cool : Blue is calming. It can be strong and steadfast or light and friendly. Almost everyone likes some shade of the color blue.Nature of Blue: A natural color, from the blue of the sky, blue is a universal color. The cool, calming effect of blue makes time pass more quickly and it can help you sleep. Blue is a good color for bedrooms. However, too much blue could dampen spirits.Culture of Blue: In many diverse cultures blue is significant in religious beliefs, brings peace, or is believed to keep the bad spirits away.
Blue conveys importance and confidence without being somber or sinister, hence the blue power suit of the corporate world and the blue uniforms of police officers. Long considered a corporate color, blue, especially darker blue, is associated with intelligence, stability, unity, and conservatism.