AprilM ... so glad that you persisted, as the result is spectacular!
As for a border ... I'd be tempted to go borderless, framing it up with a simple binding.
No idea what size it is now, but if too small, it would be a lovely wall hanging.
Yes, the mother fabric is nice to include as a reference, but that does not have to be on the front.
By chance do you have enough, to use it for the backing? or part of it?
What a nice collection of go-with fabrics you have assembled.
If not for this quilt, they could be used for another quilt, that coordinated with the OBW!