And your accent colour - from accessories such as cushions and vases - about ten per cent.

Don't let the accent colour dominate, though: more than one third and it will overpower the room.

You can add a subtle design with an accent colour or contrast your car's colour to really bring out the shape.

While scientists seek a cure for greyer's remorse, outstanding lighting and accent colour can alleviate the symptoms.

It helps to have a bold accent colour.