I love the shade of pink you've used its so sweet. I think I would find a small mini print in the shades of the paisley print that you used on the heart in the far right square to use for sashing. Then if you have any of heart fabrics left, I would sew small strips together then cut them on the bias to make a binding and repeat the look of the strips in the hearts. It would tie together everthing so sweetly.
Where did you find this pattern? I make charity quilts for the preemie units at our area hospital, I sew with the group called Threads of Love. This would make a cute small quilt, they need to 30" sqaure so its hard to find good blocks to fit a 4 or 5" square. Chris