Place the lid of the plain gift box on the calendar paper (the design side facing the surface). Trim the paper around the lid so there’s not a lot of excess paper, but you can still cover the top and sides of the lid.
Apply the glue onto the top of the box and stick the paper onto the surface.
Glue the sides of the box and fold the paper along the sides, pressing to adhere it to the box.
Trim the edges or fold the paper along the edge of the lid and glue to the interior of the box for a neater look.