Cut off the tops of box. To make a “plus sign”-shaped piece of fabric, place the box in the center of the fabric, and then measure 8 inches from the edge of box on all four sides.
Next, add one extra inch to all four sides, and then cut the fabric to this size. Using a sponge brush, apply glue to one side of the box.
Pull the fabric up and affix it to the box. At the base of the box, cut a small slit on both corners of the fabric. Apply glue to next box side, and then take the extra allowance of fabric around the side of the box, creating a nice, clean corner.
Repeat steps for the remaining sides. On the final side, make sure to fold down both edges to create nice, clean edges before you affix the fabric to the box side.
Apply glue to the fabric folded over the inside of the box to make sure the fabric is secure. Let dry for a few hours. Slide in your tree and have a perfect decoration!