Concentration Ideas

After some thinking I came up with a very broad idea and am now trying to narrow it down. Here it goes:
-organic vs. industrial
-shapes
-movement in nature (ex: river)
-control vs. free flowing
-visual descriptions (ex: wind moving using texture, shape, form)
Off of that Christine, Katie and I came up with these moving subjects that could be turned into a piece:
-water -clouds
-light -flowers (growing, dying)
-moss/tree (sketch on previous post?) -thunder/lightning
-leaves falling -sound
-rain/snow -time
-bubbles -blood/cells/neurons
-waves -smell
-steam -planets/orbits (not a huge fan, but it might work)
-volcanoes

Concentration Sketches

These are a few random ideas for my concentration. The first reminds me of moss growing or creeping around a tree. The next two are the same with some digital changes. The combination of line and shape make me think of dust particles moving in the sunlight. Thoughts?