OOPS!
Not lately ... but in the same sense,
I learned a long time ago, that as I use fabrics in a quilt, I keep them with that quilt until the end. Just in case I have brainwaves for those same design changes, as you did.
Then, once I have the top finished, the backing is made and the binding readied, even if I am not quilting it ASAP. Otherwise, that extra fabric vanishes into another project and then I am stumped as to what to use (yes, been there, done that!). The bonus is that when I get around to the quilting stage, everything is right ready to go and makes for pretty nice smooth sailing ahead to the finish line.