Opalescent is the only color of Mylar you will need to use. The Mylar film gives your embroidery the sparkle, but the regular embroidery threads give your embroidery the color. You might find other brands of Mylar in craft shops that have a wide range of color choices. But the real beauty of Mylar is that you can just use one color to do the job. You do not need to buy separate colors of Mylar because it picks up the color of the thread you are embroidering on top of it. You also need only one time to place your Mylar sheet over your embroidery design. You do not have to add more pieces or stitch them on top of each other. One layer of Mylar sheet on your embroidery design can achieve the shimmering effect you are looking for.