The top left one is based on a funny story I saw a posted on Tumblr when the Isabelle Build-A-Bear plush was new. The post mentioned how fabric that was used in the Minion plushies was reused for many plushies including Isabelle's ears as there was too much of that fabric made. I actually found it and included it as I'm writing this. Even with the funny backstory, I must say my favorite is the tennis one. It just looks nice to me.