You could "rescue" your quilt by cutting four 2 1/2 " squares for each of your blocks using a complimentary neutral color. Mark a diagonal line on the wrong side of each each of these squares. Place your small squares right sides together with your larger square just as though you had not cut the corner off. Stitch, fold over and press. I would not remove or trim the bottom little triangle, but would leave both layers for stability. You might have to still trim a bit to get all blocks a uniform size, but not much. Hope this makes sense. Don't feel bad, we were all new quilters at one time. Personally speaking, I have "salvaged" more than one project. It may not be what you had originally planned, but will be lovely all the same. I like your fabric. Good luck!