I walked around for a short while this evening, trying to get photographs of some of the late season insects.
The chlorophyll of the leaves is breaking down, leaving other pigments showing through. Carotenes, xanthophylls–those other pigments are less well known than chlorophyll, but they seem to have a role in photosynthesis as well.
A light breeze moved the leaves as I tried to capture the insects. Could the tree be capturing the kinetic energy from the breeze as an energy source? I don’t think so, but how would we know? How would you design an experiment to prove that? Has anyone done it already?
The roused bear 
Some nice colours in that second shot.
Interesting looking fly in the second photo. Wonderful detail. Any idea what species it is?
Possibly Syrphus ribesii.