A global effect is an interesting idea, and a unique challenge to design for. Definitely will keep that in mind for the future!
Thank you for the kind words regarding the layout! I am no graphic designer, I had to learn how to make all this layout from scratch, so that compliment means so much. I used Affinity for the layout using some templates from DriveThruRPG, some gradients and texture brushes for the page aging. For the borders elements, I created some overlapping shapes in the Affinity vector studio, created a brush with that element, and used the pen tool with that brush selected to trace along the outside. Here's a video I used to get me like 90% of the way there, though the way I created the initial shape was different.
