The second way of directly influencing color expression within the Sturdy shader node group is the Overlay Color option. Think of it as a coloring overlay, the strength of which you may control with the provided slider.

The Overlay Color is a great way of balancing and completing the effect of the Accent Color. For interesting effect, try putting a warm color on the Accent Color slot and a colder shade on the Overlay Color slot (or vice-versa), and then control the strength of the coloring effect with the Overlay Strength slider.