Starting along the base of the tree, unfurl yarn from the skein, then tightly and evenly wrap it around the trunk and low-hanging branches. For proper coverage, allow each strand to overlap the other, ensuring no branch surface peeks through the yarn.
To add shape, color and texture between the branches, you can make decorative hanging spheres. Unfurl yarn from the skein to use it for wrapping the foam spheres. Slowly wrap the foam sphere with yarn, using a glue gun to attach it.