Hot glue the nerd boxes to the bottom of the juice box, making sure they're centered and have a little gap between them.
Bend the ends of a pipe cleaner into hearts twisting it so it doesn't move. Hot glue it on top of the juice box.
Glue on a bow and googly eyes to an upside-down applesauce cup. Add a sharpie smile. Hot glue the applesauce cup to the top of the juice box (don't put glue on the straw hole though)
Hot glue the chocolate heart to the front of the juice box.