It's going to be a beautiful quilt/bedspread, love the colors and the blocks. I've never tried the metallic threads because of all the stories I've heard about it, but what I will suggest is going with a machine embroidery thread. Here's the site where I've bought some, they have some absolutely gorgeous threads, all kinds of colors, have fantastic service and the prices are all fabulous. I love using it for FM quilting, I think it looks so much better than using the cotton quilting threads.
Sorry for the double posting.