They are completely customizable. You can even add pretty digital papers to them!
In the storyboard below I add my Andriessen texture on top in Soft Light blending mode and a gorgeous endpaper texture from The Graphics Fairy premium site (I am a part-time instructor there) on the bottom (50% opacity). I changed the color of the endpaper by putting a Color fill layer on top of it in Color blending mode.
You can also add a texture only to the frames or just to the photos (by grouping those layers together and clipping the texture to it).
