I would say a solid medium yellow, medium pink, or Kona Black for your centers.

I say red too!! They are beautiful!!

You did a wonderful job on that! I go with red.
You don't need sashing unless you really want it. Anything would work for the borders.

Ohhh red would make it realy pop!

I see one piece of red in each, so how about a red middle? By the way, I like your glasses

I would choose red for the center.

Bright Yellow or Red was my first choice too.

Oh my gosh, I hope I can make one that nice some day. Just beautiful!

I think the centers and corner posts should be red, but it must be several different reds. Maybe find a package of fat eighths, or quarters. Then some medium value print you just adore, for the sashings.

I agree, this sounds like a great idea! I'm trying to choose centers/background and maybe sashing for my Dresden WIP right now also. I really like the idea of several different reds instead of just one fabric.