I'm doing one with red thread on top and the backing is a white on natural print with white bobbin thread.
Most of the backing looks very good, but I learned a lesson with this one - to clean out the bobbin area extra well before starting.
The machine was acting up and throwing tiny red loops here and there on the bobbin side of the quilt. That's not normal for that machine, and I should have investigated but I didn't. I just kept adjusting tensions, thinking I wasn't balanced well enough.
Finally, I removed the needle plate and there was a blanket of lint around the feed dogs, even though I had been careful to brush out and blow out from underneath every time I changed the bobbin. Once I got that lint out of there, she settled right down and didn't give me a single hiccup for the rest of the quilt.
I'm hoping that laundering will pull out the worst of the red "pokies" on the back side.