Queer Crafternoon - A felting book from the library (Needle Felting for Beginners by Roz Dace and Judy Balchin) had the great idea of using cookie cutters to make felted ornaments! And
Using Cookie Cutters as Needle Felting Supplies
The Wonder Years: Craft :: Cookie Cutter Wool Wet Felting
The Funky Felter: Easy Needle Felted Valentine Heart Tutorial Using a Cookie Cutter