Set up a piping bag so it's ready to go as soon as your chocolate is ready.
Cut your Reese's Pieces in half so you have half-circles for beaks.
Line your baking sheet with parchment paper or a silicone baking mat, and arrange your pretzels on it (see the image above for orientation to make ducks.)
Set up your double boiler over medium-low heat. Add your chocolate, and stir as it melts, pulling on and off the heat to avoid overheating it.
Once your chocolate is melted, mix in the food coloring and any extract you want to flavor it. Adjust for color and flavor to your tastes.
Pour your white chocolate into your piping bag and pipe dabs of chocolate in the pretzels to make the duck body.
Place your cut candy and sprinkles to make beaks and eyes.
Let your chocolate set, or stick it in the fridge or freezer to speed up setting. Enjoy!