For example, red, orange & yellow can help make a large room with tiny furniture look smaller & more comfortable. When you select the wall colour, keep in mind that furniture, soft furnishings & curtains are to be in harmony with the walls. If furniture upholstery, covering on the trestle-bed & curtains are patterned, it is better to make walls plain. Combination of colours is to be approached thoughtfully, do not depend on chance. 
For example, it is better not to merge red & green, because it is difficult to perceive this combination, if these colours are given in equal proportions. Bright yellow can be a lovely background for any colour (in China collections of porcelain were always exhibited against a yellow background). Stencil looks well on a yellow wall. Green poorly matches all colours, except for various tints of the same colour.
Every colour induces definite associations, & preference for a definite colour is always individual & depends on characteristic traits of the persona. It is well-known that there is no accounting for tastes. Some people have highly developed colour perception, others don't. You must have paid attention to the fact that some colours or their combinations are visually calming & set one's mind to rest, some convey the feeling of joy, some cause physical discomfort & others have a depressing effect. Of work, when you select the colours of setting, it is best to consult a designer.
When you select the colour setting of this or that room of your house, you need to take in to the account various factors: if the windows face the north, it is better to prefer warm colours, if it is the south, then cold colours will be appropriate. Other factors are the quality of lighting, because the colour reflects the light, & the kind of zone (whether it is a kitchen or a drawing-room, a kid's room or a study). Saturated, bright colours are the most suitable for setting of a drawing room or a dining room.
Plenty of peoples associate red with wealth, luxury & beauty. It is perceived as a symbol of excitement, loud communication, fuss. Well-matched tints of red look well in the hall, kitchen, kid's room, drawing room. If the room is set in cold tones, "patches" of red will make it more comfortable.Orange is associated with the golden orange. & this means warmth, vivacity, joy. The inside of a cold northern room can be set in orange tones.
Yellow is a "warm" colour. If your room is located on the northern side, abundance of yellow in the inside will produce the impression that your rooms are "cheerful", sunny, even if in fact, sunrays are rare guests in your apartment.
