Download the ninja template, print, and cut out the pieces you need.
Begin by gluing the face to the center of the mask.
Next, glue the eyes to the center of the face.
Now, place the eyebrows on top of the eyes and glue them in place.
Position the headband on the top portion of the eyebrows and glue it in place.
Glue the head of the ninja to the flap portion of the paper bag.
Glue the cross body accents around the ninja's body. Glue one in the center and top of the body. Then take the longest piece and glue it at the base of the center piece so it is angled towards the corner of the body. Finally, take the curved piece and glue it so it covers the bottom of the other two pieces. the red lining around the black background.
Finish off by gluing the ninja body to the main portion of the paper bag.