I just realized it wasn't you that is messy. It was someone else. I'm sorry.
I still see black or at least something very dark unless you don't want your lovely blocks to "pop"! Maybe a black print with very small print that "reads" solid. Are you able to send pictures to fabric shops to see if they may have something that would go with your blocks? Years ago I was at a sewing get together and I was auditioning fabrics I had brought with a quilt top. Honestly I was so frazzled and a lady I didn't know saw me trying several pieces and said wait!!! I have exactly what you need! She brought me a deep purple batik/tie dyed fabric. That was not at all a fabric that I would have even remotely considered & it was PERFECTLY PERFECT!
If you are familiar with Thimble Berry fabrics from years ago that's what I might audition! I think sashing and border would look beautiful. The fabric used for sashing & borders will make or break a quilt!
I haven't posted pictures on here in years so I can't send you pictures of what worked for me.
Please keep us posted
Your work is very pretty!