If you have considered adding ley lines, or similar magical phenomenon, to your Pathfinder world this product should be a useful resource. Not perfect by any means, but a good starting point for thinking about such magics in a world.
Ley Lines is a Pathfinder source book from Scorched Urf’ studios detailing ley lines, that is the lines of magical force that can exist in a game world (and some say exist on Earth). It details various types of ley lines, divided by color, how they affect magic (and more) and what sort of patterns (“world lace”) they can form to enhance world building along with a meta-explanation for why multiple worlds have ley lines.