Black and white are the darkest "color" and the lightest "color" respectively. As such, they contrast better than any other two colors. Black contrasted against white has a long history in symbolism.
- Aloof Dark-Haired Girl: A calm, aloof girl with dark hair. (Fits here if she's pale-skinned.)
- Black and White Insanity: When someone is completely incapable of understanding the concept of moral ambiguity.
- Black and White Magic: In an RPG group, one magic user specializes in defensive and/or healing magic while another specializes in offensive/harmful magic.
- Black and White Morality: One side of a conflict is utterly, completely good. The other is raw, pure evil.
- Black Gal on White Guy Drama: A black woman and a white man being together means they have to experience criticism.
- Chiaroscuro: In a visual medium, a single light source casts everything else in shadow.
- Eerie Pale-Skinned Brunette: A creepy character with pale, sometimes ghastly skin and brown or black hair.
- Raven Hair, Ivory Skin: A beautiful character with hair as black as ebony and skin as white as snow.
- Salt and Pepper: Two characters, one white and another black, with hilariously different personalities.
- Skunk Stripe: Dark hair with one or more streaks of white/silver running through it.
- Where Da White Women At?: A black man being with a white woman is considered taboo or humorous, or has to suffer criticism.
- White Dude, Black Dude: Joking about differences between white people and black people.
- White Hair, Black Heart: Someone with white hair just so happens to be completely evil.