I was making an Irish Chain quilt - all by hand and could not get the right green. It took me three tries until I felt could about the fabric. It was a Double Irish Chain and it was 25 squares per block - I un-sewed 3 blocks twice. But it was worth it since the other two fabrics just weren't right. Have done the same thing with GFG - I have a lot of flowers that never made it into the quilt, but are waiting to be made into a quilt of their own.