I have created a template similar to JJs that can be easily printed on 8.5x11in card stock( (instead of Michaels cards).
CLICK HERE for template
Simply print out template and cut on center line. Use construction paper or colored card stock for the cover of the passport and I suggest you add one more 1/2 sheet of paper (or more) to allow additional pages for stamping. Use a long-arm stapler to secure your passport book at the middle seam.
I have also included a graphic for the front of your passport as well CLICK HERE
Have the girls cut and paste to the front cover.