When I went to the Festival of Quilts a couple of years ago I bought a piece of Pellon Quilter's Grid because I had seen a tutorial for making a Postage Stamp quilt using the grid. It's been sat in the drawer ever since but as soon as I saw this block I looked it out to give it a try.
Oh my goodness, it is so easy to use. Just cut out 1 1/2" squares, arrange them on the Pellon, cover with a damp cloth and then press. then you just have to fold it along the joins and stitch a scant 1/4" seam from top to bottom of each row, and then turn and stitch the rows across. No matching up of seams, it just matches perfectly. Once stitched the first way I sliver trimmed the seams and pressed them open to help it lay flat and did the same for the across rows. Start to finish less than one hour, and I spent the majority of the time cutting the squares to begin with.