What will be my theme?

As I ponder about what I will want to focus on for this final project I know one thing for sure, I do want to photograph nature. Knowing nature is a broad theme, narrowing it down will be the hard part.

I have a few ideas:

1. Angles in nature - I usually capture these angles and holes that nature forms automatically, but maybe if I really try to concentrate on that I believe I can get really good photos.
2. Nature, Abstracted - While I usually don't like abstract things, trying to abstract nature might be something to try. Zooming in really close to the object so it is indistinguishable, it might be more of a struggle for me though to get good compositions, but it will be a challenge! 
3. Trees and their details - I really love trees; their branches, leaves, and the way the sun comes in through them. Focusing just on trees I would zoom in on the trunk details, the roots, leaves, etc; trying to capture the essence of the tree.

These three things are what have come to mind right now. I still have to decide or maybe even come up with something new!