According to Andrew Elliot
Colours function as a subtle primer, exerting a direct influence on motivation and behaviour without individuals’ conscious awareness […] Given that the influence of colour on our behaviour is so prevalent, it’s shocking that we aren’t more aware of it.
According to Alison Motluk
It may be nothing more than an association with big skies and the open seas, but beholding the colour blue makes you more creative. Juliet Zhu at the University of British Columbia in Vancouver, Canada, compared the effects of red and blue on people’s behaviour. While red tended to sharpen the memories of her undergraduate volunteers, blue helped to unlock their imaginations. For example, when they were given toy parts in either blue or red, the toys that the volunteers constructed in blue were rated as much more creative than those made with red (Science, vol 323, p 1226).