I made a pattern for the bookmark holder so you can see how I made it...it's really easy...hope my instructions are! lol
This is made to hold Bookmarks 2" x 5.25"
Start with a piece of cardstock 8.5" x 9" along the 9" side score at 2.25", 4.5" and 6.75"
then turn your cardstock to the 8.5" side and score at 2.75"
Now with a pencil draw lines on an angle as shown below, and cut along the solid lines. Now fold along score lines, and fold the bottom (where you cut out the triangles) up.
To hold them in place, I used 1/8" scor tape along the center scor line of the triangles, but you could sew it or add a different adhesive, but it can't be too wide or your bookmarks won't fit.