For the Ghost Pretzels: Melt white candy melts according to package directions. Dip pretzel rods into melted candy, coating about two-thirds of the way up. Place on parchment paper. While the candy is still wet, add two mini chocolate chips for eyes.
For the Monster Cookies: Preheat oven to 350°F (175°C). Line baking sheets with parchment paper.
In a medium bowl, whisk together flour, baking soda, and salt.
In a large bowl, cream together softened butter, granulated sugar, and brown sugar until light and fluffy. Beat in eggs one at a time, then stir in vanilla extract.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Divide the dough into three portions.
Color one portion green and another black using food coloring. Leave the third portion plain or color it a spooky orange.
Add chocolate chips to the plain dough. Swirl the green and black doughs together to create a marbled effect. You can also add sprinkles to one of the doughs.
Drop rounded tablespoons of dough onto the prepared baking sheets. Bake for 10-12 minutes, or until edges are lightly golden.
Let cookies cool on baking sheets for a few minutes before transferring to wire racks to cool completely.