Browns, greys and blacks all have potential to be warm or cool but are in general are considered neutral. If you mean that people seem to prefer orange, red and yellow over blue, green, purple or pink, I suppose it's fashion. Orange seems very popular in magazines and on the runway.
Blue and green can also be hard to pull off on certain skin tones but also because it's not a flesh related tone like red, brown or pink. It's a matter of taste, trends and the shade of color.
Warm colors have tendency to go well with most skin tones and eye colors, so more people wear them. Depending on the color of your eyes and your skin tone, you may be able to pull off cooler colors well. Or you may be like me, with green eyes and really pale skin, and have to stick with warmer stuff.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.