I'll be quilting this weekend too. Yesterday I found backing in my stash for the latest quilt which made me do a small happy dance, so then I went ahead and marked my quilt for quilting lines. Just a simple design, but 3/4 way through I realized it was crooked and had to go back and mark lines again. Thankfully I used two different colors of Crayola Washables and praying that I won't get confused and have to rip out stitches. Keep your fingers crossed for me please!