Thanks everyone. @my-ty - I don't want to "scribble" on my quilts either. That's why I'm doing mini ones that I'll donate. I'm OK to practice but I put in soooo much effort on my quilts, I don't want to "ruin" them.
I too get amazed at how a quilt that looks absolutely perfect and was done by a master, can still have "imperfections" when you look up close. I think we're too used to factory made products and we forget that such "flaws" can actually make something more beautiful.