I also made a star-shaped brooch. To make the tips I used a round tip tongs; the purple internal was done using another capsule (first I removed the silvery edge with the scissors). The purple internal and the brooch was glued with hot glue.
Step 1: Empty the capsules
Cut the edge of the capsules with a cutter and empty them.
Step 2: Crush the capsules
Crush the capsules with the hammer or something very durable (I used a jar).