Flannel is the best for rag quilting.
I wouldn't use batting either because you lose a layer of fluff in the seams.

Charmpack, would you just use two layers of flannel? or three?

You can use old jeans in the center and that frays real good, but it will be heavy and really warm.. Another thought would be old cotton t shirts. It wouldn't be as heavy as the denim. these are just thoughts. I'm sure whatever you decide to do your quilt will be very nice and comphy. One hint cut the fluffys seam in a v and that makes it fluff nice. enjoy your quilt Grace

I have used old jeans in the middle for warmth and flannel on the bottom to make it soft and comfy it ragged out, felt and looked good i washed the flannel a couple times 1st

I would NOT use any thing that could be washed .... How are you going to get it rag out without washing ??

Old cotton tshirts is a great idea! I have a bunch with stains on the front that I was going to throw away. great idea.

yeah, I know Annie. I guess what I was thinking is that if I use the blanket in the middle layer, and quilted it real good, it wouldn't matter. But I don't want to waste time and other fabrics and make a mess and be dissapointed