When you look at a quilt from a short distance, say 1-2 feet (like when you are quilting it) the quilting is very prominent, and the pattern of the quilt itself disappears. But when that quilt is on your bed and you stand back to admire it, most times the quilting disappears and the pattern of the quilt becomes prominent again....regardless of what quilting pattern you use or thread color. This is just my opinion and observation, others may see things differently. I personally think whatever thread color you use will be fine and something with curves/swirls as the quilting pattern to offset all the straight lines of the quilt itself. Your quilt looks great and I am jealous of such a great quilt for only your second!