I wasn't going to comment but I can't stand to keep quiet!
When taking a class on machine quilting I was told that if I used invisible thread to only quilt for short periods of time. Apparently the thread can wear some part of the sewing machine if you put the peddle to the metal and let it go for any length of time. Then you have a costly repair bill on top of everything.
On my spring tulip quilt I was really unhappy to discover I didn't have the *proper* color thread and I wanted to quilt it NOW! I laid a cream thread on the quilt top and was amazed to see the thread pick up the color of the fabric. That's what I used and I was very pleased with the results.
Try laying several threads on top of the quilt and see which one looks the way you would like the final product to look. (Of course there will still be an element of surprise when you finish!) :lol: