...but have you looked @ them upside-down yet, Anne, TK, Abigail? Or asked yourself if it is already finished and you just didn't know it yet? Maybe it's abstract and the unfinished part should be something totally different - different subject, diff medium, or cut off the unfinished part . Whatever comes to mind. It doesn't have to be a square or rectangle, or finish in the original direction it was going.
In my artistic endeavors, I've often changed my mind about what I was making as it went along. Especially when cross-stitching. I've edited many patterns to suit my preference by adding or removing elements, altering the colors, and/or added embellishments like beads, ribbon, sequins, seashells, metallic threads, decorative knots, fringes...