I showed the Faux Tile technique in my June Stamp Nights.
Colors: Blackberry Bliss, Rich Razzleberry, Smokey Slate, Whisper White
Punches: Fun Flower, Petite Petals
Tools: Basic Jewels Pearls, Simply Scored Scoring Tool, dauber, thin cardboard for masks
Here's the Technique Journal page we made with score measurements.
The trick to the shading is to brush the dauber starting on the mask inward onto the "tile" softly so you don't cover up too much of the tile with shading. Also, when brushing the outside edges with the dauber, skip over the "grout" score line to keep it white.