you can do it that way if you want- or you can do a decorative stitch across blocks- with nothing to do with the seams- or you can go down the seams it is your choice- batting (density) is dependant on your batting- some batting allows up to 10" between stitching lines- some batts need to be quilted every 2"- 4" if you are using a batt that requires closer stitching you can do cross-hatch lines- or free motion quilting- making designs in your blocks- you can use any decorative stitch your machine offers & sew the decorative stitch where ever you want in your blocks- how ever you want to do it is ok- if you just want to stitch down your seams- as long as they are close enough for the batting you are using you can do that too-