I also helped to finish off some donkey ears that were handed down to me. Originally they were folded foam. I added felt to the ears and a tuft of felt in between the ears. They still sort of read as bunny ears to me, but I was working with what I was given. And I think on stage they did the trick!
Here is the moon face I made for one of the older actresses. My directions? "Make it white and sparkly!" She was playing a he, and I had one of my 4th graders model it for me to make sure I had the shape just right. (You'll see that she also modeled the donkey ears for me, too!)