Welcome to my first Instructable! Thanks for checking it out.
Score all 4 sides top to bottom. This will weaken the box.
Poke hole in all 4 corners on top of box.
Cover top of box with tissue paper, two layers white, one layer red. I used a white glue and water solution, applied with a paint brush. Glue, paper, glue, paper, glue, paper.
Cut a hole in top of box.
Re-poke holes and push ribbon or string through, knotting ends on inside of box.
Tape bottom of box closed an cover with tissue paper.
Cover sides with tissue paper. (Two layers of white shown)
After covering sides with red, cut out and attach yellow face to one side, cut out and attach blue eye pieces.
Outline face features with black Sharpie. Make a Thor hammer piñata from a Kleenex box, wrapping paper tube, construction paper and tinfoil.