You can use a mesh roll to create different textures and effects on your Christmas tree. To start, lay the mesh flat on the ground and gather one end of the roll, creating a small bunch of mesh. Tie the mesh into a small bundle with a piece of ribbon or a small bow. Then, start wrapping the mesh around the tree from bottom to top, creating a pattern that you like. You can create different effects by wrapping the mesh in different ways, such as criss-crossing the mesh or adding a second layer. Once you've wrapped the entire tree, use small pieces of ribbon to secure the ends of the mesh.