Step 1: Line two large baking sheets with parchment paper or silicone mats. Set aside.
Step 2: Place each color of candy melts into separate microwave-safe bowls. Melt one color at a time according to package directions, typically at 50% power, stirring every 30 seconds until smooth. If too thick, stir in 1/4 teaspoon of shortening or coconut oil until desired consistency is reached.
Step 3: Hold a pretzel rod by one end and dip about two-thirds of the pretzel into the melted candy, rotating to coat evenly. Gently tap off any excess candy coating against the side of the bowl.
Step 4: Immediately lay the coated pretzel rod onto the prepared baking sheet. While the candy is still wet, generously sprinkle with your desired holiday sprinkles.
Step 5: Repeat the dipping and decorating process with the remaining pretzel rods and candy melt colors, working with one color at a time.
Step 6: Once all pretzels are dipped and decorated, transfer the baking sheets to the refrigerator to chill for at least 30-60 minutes, or until the candy coating is completely set and firm.
Step 7: Carefully remove the pretzel trees from the parchment paper. Store them in an airtight container at room temperature for up to 1-2 weeks. Enjoy your festive treats!