Modern thinking is that there are 4 basic colours, Blue, Red, Green and Yellow, and every other colour used in paint and other decorations are variations of these four (and also black and white which are not considered as colours). Although our Colour Wheel has just 12 colours, the colours vary continuously around the wheel with millions of possible shades. Each colour is associated with a perception and their use can affect the way people feel and act - so the choice of colour in decorations needs to take into consideration the nature of the area being decorated.

Blue

cold, of the sky and sea - relaxes, instils calmness and harmony. If used in large blocks, blue can make a room seem larger. Ideal for bedrooms and bathroom, not recommended for areas requiring stimulation or keeping awake, such as area for entertaining.

Red - of anger and danger - stimulates and promotes activities. In large blocks it seems to advance towards you, so can seem to make rooms smaller. Ideal in areas of activity as it quickens the wits and stimulates - however it can be tiring for someone spending a lot of time surrounded by a lot of it. Not suitable where you need to relax such as bedrooms.

Green - of nature - cleansing, instils contemplation. Ideal where you need to think such as in a study.

Yellow - of happiness - brightens the mood, makes one laugh and smile, refreshing and promotes intellectual activities. It can make rooms seem smaller. Ideal where a 'bright' mood is required such as areas used for entertainment.
Using colours together. top

There are three basic ways to combine colours using the Colour Wheel

All within a third All the colours within a third of the wheel (that any 4 adjacent colours in our wheel) will work well together in harmony.
Separated by a third Any 3 colours spaced equally around the wheel work well although - it is best to have one as a dominant colour with the other two being used to 'setoff' the effect. Such a colour scheme can give an exciting effect.
Two across Any two colours across the wheel are complementary. With one colour used as the dominant scheme, the other colour will 'set off' the effect.