After sewing the key ringson, I put interfacing on the wrong side of the back side of the ornament. Because I was hanging this ornament and not putting it on the wall, I also put the interfacing on the inside of the front side.
I put a 1/4 " seam around the edge and then turned the ornament right side out which was a little harder because of the interfacing. You don't have to sew the open edge together because of the topper that will go over it (of course you need to plan for the opening to go at the top of the ornament!)
It was a lot of fun to make and I will be making more for other people. Hoefully, I will get ours made before Christmas is over!