My backgrounds are in part limited by the program I have to work with. I thought a portrait drawn by me of Martin Luther King, Jr. could unintentionally be construed as negative. I in no way intend or mean to be offensive so if you're offended just pretend you're not, go see a professional for whatever issues you have, and don't use the wallpaper.
I received this quote on all things from Runner's World but have been saving it for this occasion. "The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands at times of challenge and controversy." -Martin Luther King, Jr.