I put a lot of thought and consideration into the topic of my trend research. Since all of my work right now is very specialized in to categories - web design and online marketing - the research had to fit into one of them. Also, I wanted it to be about something that I enjoy.
So I picked Pinterest Marketing. It is something I have been experimenting with on my own for some time now. It is a new and narrow marketing niche, but quite powerful in my opinion.