Lanterns play a key role in Halloween door decorations by adding warm ambient lighting that enhances mood and texture after dark. They help anchor monochrome or witchy botanical themes by serving as visual weight and functional décor. Placing them in groups or lines creates welcoming shadows and highlights layered elements like gauze or moss. Lanterns also aid in balancing bold colors and soft textures, enriching the spooky or cozy atmosphere. Their glow invites neighbors and trick-or-treaters, making your porch feel alive and styled.