Turn on the oven to 400 degrees F (204 C). Thaw 1 full package (17.3 ounces or 490 g) of puff pastry according to the manufacturer's instructions. Ensure that the pastry is soft enough to handle, but not too warm. If the pastry is warm, it will be sticky and difficult to work with. Sprinkle a little flour onto your work space and set one thawed piece of puff pastry on it. Unfold the pastry and use a rolling pin to roll the pastry into a large square. Get out three star cookie cutters in different sizes. Cut four star shapes using each cookie cutter. Repeat this with the other sheet of puff pastry. Keep in mind that to assemble the trees you'll have four large puff pastry stars, four medium-sized stars for the middles, and four smaller stars for the tops. Place the puff pastry stars on two baking sheets. Bake them in the preheated oven for 10 minutes. The stars should turn golden brown and puff up once they've finished baking. Carefully take the puff pastry stars out of the oven and transfer them to a wire rack to cool. You should have a total of 24 stars in three different sizes. This will give you eight finished puff pastry Christmas trees. Place eight large stars on your work space. Top each of them with 1 teaspoon of vanilla pudding or lemon curd. Set a medium star on top of the larger one so it sticks. Place another teaspoon of the filling on the middle star and top it with a small star. Do this for each of the trees.  You'll need a total of 1/3 cup (76 g) of vanilla pudding or lemon curd. Try to alternate the points of the stars as you stack them. This will make them look like tree branches. Warm up 1/3 cup (113 g) of honey in the microwave until it's thin. Drizzle each of the trees with some of the honey. Then you can sprinkle green decorating sugar over the trees. Top each of the Christmas trees with a fresh raspberry or maraschino cherry half. The honey will help the sugar stick. If you don't like the texture of the decorating sugar, you can omit it.

Summary:
Thaw the puff pastry and preheat the oven. Roll out the puff pastry and cut out stars. Bake the puff pastry stars. Assemble the trees using pudding or curd. Decorate the puff pastry Christmas trees.