Starting with darker and more natural colors in background, I lifted the acrylic colors by scrubbing out the stones with a hard bristle brish and Citrosolve, a cleaning product.
This process can be speeded up by allowing the citrosolve to sit longer on the places you want to remove paint by lifting with a moist paper towel, but that takes it all the way back to gesso layer. You lose the textural effects on the stones that way.
The stones are what I was striving for here.