Magnolia, you did a wonderful job piecing the top! I think your quilt thread color will be great. You might want to cross hatch the center by stitching diagonally at each block intersection, then around the border choose a simple design to stitch in outline quilting, like a floral to match what you have on the backing. Just take care to mark lines with disappearing pen/pencil.
Cross hatching is criscrossing at corners of pieced blocks.