Very cool. This makes me think of one of my dimmer ideas; the
self-illuminating flag.

Woven into the flag's fabric are long cylindrical piezoelectric
threads. Each has a double helix of conductor on its surface. As the
flag flaps in the wind, the bending of these threads generates a noise
waveform between the conductors. Somehow these voltages are applied to
a (tiny) full wave rectifier and then to LEDs glued in place to follow
the flag's design (think twinkling stars on Old Glory).

Homework question 1: Given windspeed and thread diameter, what is the
optimal pitch on the helix? ;-)

I thought however there might be an impedance matching problem.
Piezoelectric stuff tends to be high voltage, low current while LEDs
are the other way around. NEC doesn't seem bothered though.

Then there's the power tree, a branching structure of piezoelectric
threads of various sizes (trunk, branch, leaf, etc.) that looks sort
of like a giant version of those lamps made from splaying a bundle of
optic fibers. It works like the flag but just bends randomly in the
wind like a real tree.