I've seen the use of three-color (trichromatic) graphics in multiple places, and every time it ends up looking *really good*. It's (I think?) typically **black + white + *one* other color**. It has a very clean look, while being more interesting than straight up black and white.
Examples of trichromatic graphics:
- [[The Bullet Journal Method]] - B&W + Yellow
- Some other thing I've used in these notes also used black & white + yellow, I just cannot pull the reference
- [Google Chrome explainer comic](https://www.google.com/googlebooks/chrome/small_30.html) - B&W + Blue
****
# More
## Source
- self