MSQC has a layer cake pattern where you cut the 10" pieces thru the center so you have two stacks that are 5" x 10". Take the top piece from one stack and put it on the bottom, then sew the two pieces back together. Once all the blocks are sewn back together, turn the blocks 1/4 turn and cut again, this time off center, maybe at 7". Once again, take the top piece from one stack and put it on the bottom, then sew the two pieces back together. If you start with 40 - 10" squares, you will end up with 40 blocks. You can just sew the blocks together and make a scrappy looking quilt or you can sash the blocks using yardage. I made a couple baby quilts from one layer cake and it went very quickly.