Black, Brown, Shadows and Darkness shouldn't be your lazy way of representing YOUR idea of evil. Address the symbolism of what act of evil you're addressing in your writing, art, song or drama.
Use tension, heaviness, vastness, sensation and colour. What lays in the darkness of your fears, what's casting the shadow?
Explore, experiment and evolve.
In my world Black is magic, black is love, black is time and black is family.