I have FMQ on a domestic sewing machine from the backside of the quilt because the fabrics in the top were so busy. The quilt top had really bright colours while the backing was a dark red solid. I used a variegated thread as the bobbin thread and a plain red on the top . It was better to have the odd pokie on the quilt top as the busy fabric hid them and looked part of the variegated thread because, pokies on that solid back would show up even more. I ran into only one problem of a flipped seam that I had missed but other than that it was easy going.
When doing bobbin work I plan the quilting "route" carefully. I have done this and run out of bobbin thread after just a few short passes across the quilt and I found it harder to hide the join in the middle of the quilt.
Hope this helps
HettyB