What a great use of that panel! You did a wonderful job.
A few years ago I became sort of addicted to using panels for chenille wall hangings. There are such wonderful panels available now to use as artwork. I have made 4 of them (2 spring-sumer flower prints; 1 Christmas print; 1 fall print for a housewarming gift). I have two "in the wings" (1 patriotic with flag and eagle; 1 fall). Can't wait to get started on them. I do use batting (warm-and-white or natural).
Yes, the straight stitching gets a little boring. The technique also works well for potholders, bags, etc.