I just used leftovers for practice. Some were strips (approx 9"x15") and some were more squares (approx 16"x16"). I didn't make anything especially square--just scraps of muslin and batting. I think I'll do some potholders/hot pads before trying my practice quilt. Just have to find some extra time!
Thanks to everyone for your encouragement--I'm usually not so hesitant to try something new, but this was hard! I kept thinking of the TV show that the painter, Bob Ross, used to do. He would have a beautiful landscape on canvas, then came the dreaded (to me) words, "You know, I think a big tree lives right here" and he would proceed to paint said tree right in the foreground over his lovely picture! His always turned out beautifully, but the idea of my trying to put quilting all over the piecing I had worked so long on, gave me the same sinking feeling!