So what to do...well, I decided that I would end up with a "humble block," one that is intentionally made with a mistake, so that the quilter remains humble in her imperfections.
Here's the substitute I have decided to use.
If one knows to look for it, it will be easy to locate, but in the larger scheme, it will be just another purply-blue in a vast collection of blues. I think it will be fun having it in there, and I am eager to get on with finishing this block and the 9th block.
And speaking of the 9th block, here are the parts for it:
Happy Quilting, Friends!