I agree with the others - embroider first. I would use a sashing, thin and maybe in an almond or warm cream color. I would do a decorative quilting stitch in the sashing with a matching thread. I think this would set off the fabrics in the blocks, enhancing them without distracting from them. Also a very neutral cotton for the backing. Might use just a slightly darker bobbin thread for the quilting just to give a bit more interest. Then you could decide what additional quilting is necessary. I might limit it to a smallish motif in the center of each block. This quilt is probably not going to get 'hard' use, so it shouldn't require heavy quilting.