What color thread do you use? I'm using the color of the back, but what are you using for the tops. There are the dark colored parts and I hesitate using the same color through the dark colors especially. PLEASE, I need an answer before I finish the 2nd quilt. For my own quilts I use a lot of monofilament on top so the thread doesn't show but the quilting does. I'd appreciate knowin how you do it. These are my 1st ones for Q4K.