I keep every bit of fabric, including the selvedges. The Block of the Month for September was "selvedge spools". I had no issues trying to find the selvedges, but did have issues with the inset seams. If this were my block, I'd make 1/2 square triangles for each corner of the spool and stitch the pieces together like a 9-patch - sssoooooo much simpler than inset seams. I made two blocks for the draw, but didn't win.