I'm sorry about the cell phone quality photos, but I didn't have my regular camera with me.
You will need a large piece of construction paper, white copy paper (or lined paper), a rubber band and 2 popsicle sticks.
(I cannot get this photo to flip around!!!!)
Fold the construction paper in half and hole punch with 2 holes.
Cut the copy paper in half (or to the size you want them to be) and hole punch them with 2 holes just like the construction paper.
String a rubber band through the back cover and the copy paper. Then put a popsicle stick through that rubber band to hold in place. Take the other end of the rubber band and string it through the other hole of the cover and papers. Now string that side through the front of the cover and slide a popsicle stick through the end of the rubber band.
Remove the first popsicle stick and pull the rubberband through the front cover. Slide the other end of the stick through the rubber band and you're done!