Years ago when we lived in a drafty old farm house without central heat---just coal and then later oil stoves, Mom would use old corduroy pants and denim ones too. She'd cut them into simple squares, rather large, and sew them together. She never tried to quilt them, just tied them. They're very warm, very heavy but if you live where it gets really cold there's just nothing much nicer. Also, in a "cabin" style home they look great on the back of a couch, on a chair or folded on the foot of the bed. If you don't want it to be quite so heavy, don't use batting. You can back them with flannel or muslin, and use a lightweight sheet blanket for batting for a medium warmth.
And if you alternate the way the wale is running it will give it a great almost woven look.