Hi Eddie,
Dudes that quilt, rock!
Seriously though, I like to "use my colors" when choosing the binding and backing for a quilt. I certainly understand keeping it economical by using the large (or not) plain muslin. I have used it a couple of times and try to match thread density so it will wear close to the same rate as the rest of the quilt. I am no expert, but I can see that some of the muslin is thin and furry-fuzzy which makes me worry it won''t take too many washings in a machine.
There are a few books out there which illustrate ideas in pieced backs! A good and creative way to get around not having or finding just the right cloth for a project back.
Helps use up any scraps from the project too, as if a scraps storage crate could ever become too full!
signed,
"Another dude that pieces and is trying to learn to quilt."