OK David. Calm down. Perhaps this will lighten up your depression. You will need to remake the torn part. That means taking out the pieces, cutting templates and making new block. The backing would need to be pieced.
So it can be done. Now to fabric. You can go to Goodwill or Salvation Army and get faded clothing that would match the look of the replacing pieces. OR.......if you ever come down to the $1.99 store and bring it, I could go into my closet and find matching fabrics. Does either of these suggestions lighten up your day.