in a quilt like the one you link to, where the whole point is scrappy, I always leave out scraps that read as black or red. They scream at everyone else
![Smile](https://cdn.quiltingboard.com/images/smilies/smile.png)
But look how stunning those black sashings are, with the black used with a purpose.
I always use a good mix of neutrals and whites, so when blended they too serve their purpose as spots of light, without again, screaming at each other.