I love this idea, very dramatic!
But in your photo, the very bright pink draws my eye immediately, to the exclusion of the other blocks. It feels slightly garish with this sophisticated black, somehow.
You might try auditioning other colors in a darker value....royal blue, jade, crimson/wine/pomegranate/deep rose, or some form of orange/rust/deep pumpkin, even purples.
In any event it's *your* quilt and will be delightful when you are finished!
Jan in VA