To me, this is quilt is an optical illusion. The blocks float above the cream background, so to my mind, the cream is like a contiguous plane. Like a wall, or carpet. To continue that illusion, I would either not quilt the cream background at all, just SITD around the black & colored blocks. OR do the lines, BUT, I would have to have all the lines going in the same direction, so the short spaces between the blocks would have to have short lines running parallel with the long ones, which is a real PITB to do. The curls, swirls etc, to me turn the cream into sashing, which (to me) is not what this quilt is about. Guess I have strong opinions on this one
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LOVE, LOVE, LOVE, your fabric choices!!!!