I use old flannel sheets whenever possible. Get mine at local thrift shops

I have a old quilt and it ended up with a hole in it and as I looked real close, there was no batting they used some old drapes. It worked though, kept a person warm.

That is such an awesome idea! You guys rock and roll! I want to make some quilts for my daughter to send to their missionary in India taking care of children whose parents were murdered in front of them for their faith...an untold story..and they have nothing! So Thankyou! They will have body but not to heavy!! Awesome answer!

I use many blankets or flannel in my quilts. My kids like the heavyness of them.

The last quilt I made had a goodwill flannel sheet used as batting.... Looks great! Feels great!

what did you back it with?

I use flannel alot!
And, I don't even have a fancy shmancy quilting machine to get the job done. They quilt up great.
of course, I am not making a quilt art quilt, so the quilting is very large and loose.
However! If you choose to handquilt, I don't know if the flannel is as easy to quilt through, which might make a difference for you.
Tip: If you are using pieces for your batting, straighten the edges, butt them up against each other, and rather than zigzagging them together, use lightweight fusible webbing to hold them together - - you will get a flatter joint and more stable also. I usually cut my fusible into 1 inch widths to accomplish the task <wave>

When I first began quilting, I only used flannel sheet for a batting. They were very flat, not as hot as regular (family all in the south), and added strength to prevent stretching due to any bias piecing. However, it is critical to pre shrink. Flannel shrinks much more than other cottons we use for sewing.

I use flannel sheets and old blankets as batting, my friend just gave me several yards of wool and I just made a quilt and used that as the batting as well, I was going to use it as the backing but it was to itchy.

I use flannel a lot for batting in my quilts. Love the way it feels. It is easy to quilt. When I find a good deal I buy 10-12 yds.