Yup. The very first full size quilt I made. Up to that point I had only made pot holders and table runners, then I selected "Bento Box" as my first pattern as I was told it was easy. It was easy, even with the mistake in the pattern that I caught and worked around. The problem was that I didn't yet understand how colors and values (mostly values) work in quilts, or in that pattern in particular. The end result is a very muddy colored quilt that doesn't do the pattern justice. To make matters worse, I thought a cool way to quilt it would be to use an embroidery stitch with metallic thread - without knowing HOW to do that (ie, now I know to use A) a walking foot, and B) a metallic needle). I have it about 3/4 way quilted before I finally put it aside in disgust.
But I learned a LOT from that disaster!!