Not my topic but I have an example...
I have a Focused Practitioner Terramancer, would Thematic Terramancy be too broad? In my mind that would mean he could do tracking spells with a electromagnetic theme, wards with an earth/electric theme, and craft items to aid him controlling these Earth Forces. I'm concerned this isn't a theme, just a cheat. But for what I have in mind, it doesn't seem much different than the Photomancy example on page 286.