So, if one would want to illuminate a structure to indicate and honor the Martin Luther King day in the USA, what color could be the most appropriate. I thought purple because I have seen preachers with purple scarves, ...............but also with gold thrones!
As to "green", in the USA, it is used most as a mark of conscious protection of the environment......or St Patrick's Day where Blacks, Protestants, Secretaries and folk going to a bar for a whiskey or a beer or finding a date for a "hookup" all are Irish for the night, LOL!
Asher