Just wanted to post an update.
Some of the designs I found and the EQ design gal288 shared with me inspired me to try applying stack-and-whack/kaleidoscope to this quilt.
I include below the original fabric plus the result which will be the center of the quilt.
The original fabric
[ATTACH=CONFIG]185891[/ATTACH]
The quilt's center using above fabric
[ATTACH=CONFIG]185892[/ATTACH]