Or. . .

Use the dark blues with the second group.

Oh, please, someone stop me!

I'm dithering.   .   .   .

Addendum:
I finally got myself off the teal and nothing but teal kick since I really didn't have enough dark teal fabrics for sufficient variety, and I pulled a nice selection of truer blue fat quarters to use instead.  So I'm done dithering and worrying and second guessing.  I have my fabrics for the mystery.  Relief!