Until this step I had never sewn on foundation papers, despite having made dozens of string and scrap quilts. It certainly is a much better finish, and you can use quite small strings. And because it's a mystery I can't look at the finished product and think about how I can make it easier, and skip some of those pesky middle bits .... very good for the soul I think, a bit of discipline.
Bonnie encouraged us not to use just cream or white tone-on-tones but to mix it up a bit. I think I've done that, in fact I don't think I own nearly enough neutrals for this. I've only made a dozen blocks (of the 60) and my scrap pile is dwindling! I might have to buy something, bummer :)