Flannel ... I have a quilt with a pieced cotton top, cotton backing and flannel as the batting. It's not too heavy in weight, nor in warmth. Nor is it bulky but gives a lovely snuggly feel when draped over you, with or without a bedsheet! Drapes nicely if hanging over the edge of hte bed. I call it a summer quilt, as it is just right when it's warm, but you still want something! Actually it stays on my bed year round along with whatever extra quilts I use.
Fleece ... Used it as an all-in-one backing/batting with a pieced top. Good and warm because of the poly-fleece, but not heavy-weight against the body. With time, use and washings, the fleece has started to break down. While it is still nice and soft and snuggly, it is just not as soft and pettable if you KWIM? Just the way that some fleeces go with use. Quilted it on my DSM but found it would bind/stick on the machine bed. Solved that problem by flipping the quilt over, and quilted with the fleece on top.
Old Blankets ... Was given a lap quilt years ago with an old wool blanket as the batting. It was always the top favourite fought after family room quilt year round. The quilt had been hand tied, and I am not so sure it would have been as loved by all, if it had been machine quilted. The hand tying did it's job of holding it all together ... but kept the quilt nice and flexible, IOW snuggly!
Wool Batting ... My winter bed quilt has a commercial wool batting. Because I have loved all along, this winter I have been thinking of making a summery floral quilt, with a wool batting. So now ... you have me thinking of using some of my wool blankets as battings in upcoming quilts! Why Not?
Poly Yardages and Poly Double Knits ... A couple of add-ons, for you to consider before deciding to use these sorts of fabrics. Yes, I used the poly-fleece recognizing the risks! And we all have lots of other polyester/artificial fibres throughout our homes. Another concern I have in polyester-anythings is the pilling that happens. My 1st quilt was a QIAD with a polyester backing; also, the sashings for coordination. I was a naive newbie, so just went with what the quilt store recommended. Their reasonings were the quilt would slide easier when making the bed etc. Yes, it slid nicely and because of the poly the colour stayed true. What I did not like, was how with time, the fabric started to pill, because of the poly content.
Trial Run ... You could always do a trial run, making a small quilt, whether lap size or a smaller table topper or whatever, and see what you think!