it's not a stack 'n' whack - those are kaleidoscope blocks with the fabric cut precisely on the repeat.
I think you're talking about the Stack the Deck quilts. For reference purposes only, here's a link to the Martingale Website for one of the books:
http://www.martingale-pub.com/store/...roducts_id=947
General directions: When making the stack of squares, you need one piece of fabric for each block you plan to make. You can repeat fabrics - that's up to you. Carefully pile the squares up, all face-up. Make a cut so that there are now two piles. For one of those piles, take the top piece of fabric, and put it on the bottom. Now make a 2nd cut only through ONE of the piles. Put the top piece on the bottom and make another cut, until you have the same # of piles as you do fabrics. To sew together, reverse the order that you made the cuts.