Workers who feel off colour should have their office computers changed from grey to bright orange to help them beat the winter blues.

Colourful computers can have a positive emotional and psychological effect on staff and can even boost productivity, according to a recent report.

According to a survey commissioned by retailer PC World, a splash of colour can help tackle stress, lack of motivation and seasonal affective disorder (Sad).

PC World suggested red computers to boost motivation, blue to encourage composure and tranquillity, orange to lift the spirits, violet to stimulate imagination, turquoise to boost confidence and mint green to nurture fresh ideas.