Maybe just outline the main features of each block/motif and then maybe a meander/stipple type thing in the "backgrounds"?

I am in the group that thinks (in most cases) that the piecing should get more attention than the quilting.

I agree with Bear, a meander or stipple in a color that blends would probably be best.

ITA with BearIsGray and Peckish ...
SITD around the black will help to emphasize your work.

Stipple or Meander in the background would work, though there is not a lot of background, so it may not be needed, depending on the size of the blocks.

If the blocks are larger in side, you may want to do something on the coloured fabrics, especially the white/cream one. This could be linear work, or something curvy could be good too.

I am guessing there is some sort of sashing to join the blocks together.
Again, probably just a little outline work.

As already mentioned ... check your batting requirements so you know how min/max for the quilting stitches.

Some interesting blocks ... would love to see how they come together in a quilt.
Maybe your daughter would do a photo for you, so you can show us.

Since each block is different, this is a good time to try some new designs....I suggest doing on paper or my fav-kids magna-doodle- recycled after gg got bored with it....in common areas do stipple or curls or whatever has already been suggested.