There is no dearth of topics. If you are deeply involved in your studies, let me know how much you follow in the HR domain around you. Every Wednesday, Times of India brings out a supplement, a pull-out, called Ascent... Have you ever read it? If you are reading avidly, such contemporary magazines, which will be several notches above your textbook/curriculum, you will be able to zero in on the topic you are looking for. Niche topics keep changing. What was niche three years ago may not be relevant now. Even if I suggest some topics now, they may be out of context a few months down the line.
Transformational HR vs. Transactional HR
Still, a few topics that come to my mind relate to Transformational HR instead of Transactional HR.
HR as a Business Partner
HR as a business partner, HR for the digital age, HR for startups, HR's role in IT companies where jobs are uncertain.
Project Guy to Bench with a Pink Slip
These things come to my mind spontaneously. Read HR Ascent, and you may get some more ideas. Eminent HR people write articles there... Read and update yourself. Best wishes.