Although not my favorite, and a funky size to boot - it is nice to have these blocks all sashed together, bordered and ready to be quilted. Of course, once it is quilted I probably will love it - that always happens. In anycase - School Boy certainly loves, loves, loves it - which means I will probably buy either fleece or flannel for the backing - he likes snuggly and soft fabrics! And he has already demonstrated to me - by crawling under it during construction process - that it truly is the perfect size for him!
When I have used fleece for backings in the past, I have not used a batting. Fleece usually comes in 60" width so if you get it on sale it is a good bargain for kids quilts backings. I always pay extra for the anti-pill fleece, it is well worth it because it holds up to repeated washings!