Not that challenging, but I'm finishing a top for a friend that was started by an aunt 15 or 20 years ago and never finished. She had partially hand pieced and partially machine pieced her blocks. They are uneven sizes and don't line up very well. I took a lot of it apart and reassembled. My friend gave me the fabric and odds and ends when her aunt died (my friend doesn't quilt). So I'm finishing it as a surprise for her. I didn't tell her, it's just going to show up in the mail one day! Soon I hope.