I have a phobia-of making a backing too small for my quilts. So I over-compensate, BIG TIME!
So, when I decided to make my own backing for the tool quilt, using my scraps/stash, I made the top big, (overkill!). I wanted to make a couple of more borders, but decided not too
I also came very close to just making another quilt top, but then I would have to worry about (sort of) matching the back of two (2,, not 1) quilts. The 4 blue corners are the "just in case" corners.....they are there if I need them. Whatever I trim from the sides after quilting, I will use for the binding.