The Flower Petal Cupper Set from Kemper Tools is a great little tool for shaping clay into delicate forms.  
 
This set includes 6 different sizes.
 
It's most commonly used to form various shapes and sizes of flower petals, by simply placing a thin rolled layer of clay into the ball, pulling it down over the cup and trimming to the desired size.  Remove clay from the cup and shape ends.  Use this to make individual flower petals or the base of a whole flower.
 
Made of smooth hardwood with no finish.
The stick remains porous for easy separation.