I understand the situation you find yourself in. You are more concerned about what it will look like finished. Orange and black are certainly opposite colors. I think it will look beautiful either way but if you are really concerned about it you can use the clear thread that looks more like fishing line. I have found that it is difficult to work with however. Follow your quilting heart and use the thread that feels good to you. I hope you will post a pic when you are done. Happy Quiilting