Around the world, when people are asked what their favourite colour is they are more likely to say it is blue than any other colour. The colour that people are most likely to say is their least favourite colour is a particularly yellow-ish yellow-green.
You know what your own favourite colour is and also the favourite colours of whomever you share your home with, and you should use them whenever appropriate. Knowing about blue and yellow-green can come in handy if you’re painting rooms in your home before you put it up for sale or something similar. If you want perspective buyers to think more positively about your home, paint spaces blue.