This is something I have been trying to figure out for like a year.
Harry's eyes (and lillies for that sake) are green Vs Voldys eyes being scarlet.
Ron is constantly cloted in maroon (a reddy coulor) while Harrys clothes are ofthen green. Does this mean there is some sort of trait that Ron and Voldy share.
And then you think of the school houses. Gryffindor is scarlet while slytherin is green. We are told Gryfindor are the brave and slytherin is the cunning.
But do the meanings for those colours apply the same as with Harry etc.
Once you start looking for the different colours you see them everywhere, in the first books Fudge was often seen wearing green. McGonnagall always wears green too.
I have a feeling that the use of coulours is probably important but I just don't fully understand the meanings so if anyone has any ideas.