Our guild has done this and we are currently doing this for a Hospice house in our area. You start with at least and 8 1/2" block. Cut it once on a diagonal, take the top fabric, put it on the bottom. Sew those two pieces together. Now, stack those up and do the same thing all over again. You then have to square them up. You can use as many fabrics you want, either sash or not. A very quick and easy quilt project that looks great when it's done. Hope this helps you out.