Jack Stock), or some funk-eugh colour from the op shop or ripped out of an old garment. Just make sure it's colourfast, though. You don't want to cover red piping with a lovely cream satin and then have it run in the wash!
Then cut your bias strips of your new fabric, fold over the piping, keeping the fabric nice and firm around the cord, and stitch down. If you use a great big stitch, it will take no time at all, and try to sew closer to the edge rather than the cord (like the gray on the far right). That way when you insert it into your garment the basting stitches will be hidden in the seam. When you do insert it, use an invisible zipper foot to get nice and close to the cord for a neat finish.
And voilà! Custom piping that is easy and quick to make.