QNS, all your fabrics look really fun together. Sorry you had so much trouble! This one really was a booger.
When I end up with blocks I am not going to use, I make them into a little sandwich to keep by my machine. I use it to test my machine tension for quilting (I have a lot of trouble and my machine does NOT stay perfectly set), and I also use it as a handy coaster by the machine for my coffee cup! Maybe you can still get some use out of your Peony block!
I keep mine until they are so covered with stitching tests that I can't tell one from another.