On possibility is that color is used to make the darker months more bearable. I live in Spain now, but am from Sweden. Whenever i visit Sweden during Christmas

On possibility is that color is used to make the darker months more bearable. I live in Spain now, but am from Sweden. Whenever i visit Sweden during Christmas I see a lot of reds and greens in the houses with lots of lights and decorations etc. Meanwhile, in Spain, people do decorate, but its normally less colors, more pastels etc. Barcelona city mostly uses blue lights for street decorations, which makes the streets feel even colder.