Happy March! (A few hours early.) I have to leave very early in the morning so I'm posting this tonight.
Yes, many of you were correct - a shamrock, but a modern one.
Each leaf has 8 hexies for a total of 32.
When you're ready to appliqué, fold the background square diagonally into fourth. The diagonal creases will help you place your leaves.
The leaves should meet in the middle to make a four pointed start as you can see below.
Have fun with it!