Traditionally, Churn Dash is done in two different colours. But since I have already done Wrench in two colours, I thought I could give this one more distinction by using three.
If you do the background triangles at the corners in a different print than the rest of the background, you can create a secondary pattern when doing a quilt with churn dash blocks only.
Another very pretty alternative is to do the centre square in the same print as the inner triangles. But then you loose the ring-like look and thus the link to the block’s name.