We used: Empty cereal boxes, scissors, glue, ribbon, felt and colorful paper (scrap book paper, wrapping paper or even magazine pages. )
Cut the paper into squares about 3 x 3 inches. Or whatever size you want.
Glue the paper all over the box.
Cut out hearts (I used felt but paper would work just as well.)
Glue on the hearts.
On the sides of the box, poke a hole and thread through the ribbon. Tie a knot in the ribbon on the inside of the box.
Now you can still close the box.