@ all anti-blues
+ n (where n is huge)
Our local village tree (council-provided) is blue-lit only. Other suburbs also have plain colours, either, green, blue or white. When we complained a couple of years ago, we were actually told, "You should have complained before we put them up", i.e. before we had even seen them! They were always multi-coloured before that, which was correctly blue, white, red, green and yellow. NB - not orange or pink, either!
Black is also not a Christmas colour, nor is purple, though these were the predominant shades of tinsel with which the kids decorated their instruments for our shows....aaaagh....!