I made one for my son that had a hunting/fishing theme to it. I mixed cotton and flannel on the top and used leftover flannel from when I made flannel shirts for the back. I used fleece in between the layers. That thing is WARM! He and his wife love it. They are penny pinching college students again and keep their heat low to save money.
He gets that penny pinching honestly. I have saved all of the corners from those tied fleece blankets that everyone made for year. Those are what I used as my "batting".