Cute!!
If you make it of flannel instead of calico, you don't even need to use batting. And I used a straight stitch instead of a buttonhole, so on the back it just acts and looks like quilting.
Even with calico and batting, it doesn't need any other quilting than sewing the flaps down unless your circles were really big. I used a 10" dinner plate for mine. I treated it like a ruler and rotary cut right around it.
This one is really cute! I like the bright cheerful colors.