So the Core'dinations cardstock (cs) is lighter in the core of the paper and it's textured on one side. so you can tear it or sand it to reveal the 2nd shade.
Here I have crumpled it and then sanded it.
Stamps: Reason to Smile, Sweet Essentials
Paper: Gumball Green Core'dinations, Perfect Plum, WW
Ink: Gumball Green, Perfect Plum, Whisper White craft
Accessories: White embossing powder, 1 3/8" Square punch
Stamps: Bright Hopes (retired), More Merry MessagesPaper: Primrose Petals, Raspberry Ripple, Gumball Green Core'dinations, WW
Ink: Gumball Green, Garden Green
Accessories: Raspberry Ripple Dahlia