I love to embroider those pre-stamped quilt squares! I have 3 different squares started right now. I have one top already finished ready to quilt. I got my squares from J. D. Needleart and they have much more variety than Herschner's.
I believe the blue markings should wash out - at least they do on the JDNeedleart squares. I have some friends who have made quilts out of these squares and they are absolutely beautiful! If there are any questions I can answer I will be glad to try.