A ton of poison ivy:
Plants with those infected bulbous things. Aren't those from parasitic wasps?
I love the gradient of the sky in this pic:
Field ... oops my shadow got in the way :P
Bugs - beetles, a grasshopper, and what looks like a stink bug.
You could wave your hand over the grass, and dozens of tiny grasshoppers and crickets would jump around. If you listen closely, it sounds like rain drops falling! xD
This one makes my eyes hurt a bit ... it looks like the picture is all warped, even though it isn't.
Hows this for being natural? xD
And finally my favorite: