h a l f b a k e r y
Not so much a thought experiment as a single neuron misfire.
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Wind + Fan blades + LEDs = Self Powering (Lit) Sign
Combine the Persistence of Vision LED display
with a rotating Fan, when its windy the blade spins. While the blades are spinning they power a microprocessor controlled array of LEDs on the fan blade.
Using a persistence of vision trick a scrolling message can appear when the Fan blades are spinning
Colour Animated graphics are also possible with RGB LEDs.
This kind of sign could be nearly any shape or size, so long as it is free to rotate and catches the wind. A certain minimum airspeed is needed to the persistence of vision effect to work however.
Ceiling Fan TV [trekbody, Apr 19 2007]
||You could store the electricity generated by charging a battery, and then use it to power the display when the wind isn't blowing.
I'm sitting about 20 feet from one right now, so I guess it is baked.