This was a great way to clean out about 37 bobbins partially filled with, well, who knows WHAT kind of thread. I used it all. I zigzagged over plain white clothesline 3 times using all the leftovers I had and then some.
Then, I zigzagged the bowl together with variegated thread. You can see a color shift from the inside to the outside. That's because I used different thread in the bobbin than I did on the top.
Nuthin' but thread.