Mistakes happen and as long as we can laugh at ourselves for doing it, its okay. I just noticed I put a neutral fabric backwards on a block I was working on, even had it trimmed and hadn't noticed it till I went to add the next strip. So frogged the 1st piece, cut a new piece to replace it and went on my merry way. Just glad I caught it before I'd added the rest of the strips. Lets face it...........it happens to the best of us one time or another.