I'd use a flannel for the batting....I have done that a number of times in the past, when I wanted just a small 'batting' and it was a quilt that would get lots of use. Its easy to quilt, and it makes a very nice finished quilt once washed - it has that nice wrinkly look we all love. I have also used warm & natural (my favorite), which is also nice, but it makes for a heavier quilt.