My nephew's plastic toys disagree, as do my sister-in-laws clothes. Also, Barbie.
[Edit] This was a bit tongue-in-cheek but I think the point stands. There is massive diversity about what colours and colour combinations are acceptable in different contexts and to different groups of people. I would agree that is currently a trend for grey furnishings in domestic contexts but society as a whole has never had a wider range of colours on show, I suspect, certainly if you consider all the new possibilities delivered by screens.