To make a Lego Christmas tree, you'll need the following supplies: a baseplate (preferably green), green and red Lego bricks, and a few decorations such as stars, bells, or ornaments. First, create a cone-shaped base by stacking green bricks on top of each other. Then, add red bricks around the edge of the cone to create the look of a Christmas tree. You can then add decorations to the tree such as a star on top or bells on the branches. Finally, add a few presents underneath the tree to complete the look.