quietrevolution display tourbines combine wind energy with LED displays:
"QR is available in a model capable of creating a visual display that is part artwork, part renewable energy device, part communications medium. LEDs embedded in each of its three S-shaped blades fire in sequence as the blades rotate, painting a video screen that appears to hang in the air. This full colour and motion image is clearly visible day and night."
Thanks for the hint Oliver Ionescu!