How would you like to be branded as a commodity for your "potential?" Already done.

"Devices powered by harvested energy have longer lifetime and provide more comfort and safety than conventional devices. A good solution to energy problems in wireless sensors is to scavenge energy from the ambient environment. Energies that may be scavenged include infrared radiant energy, thermal energy (solar–thermal, geothermal gradients of temperature, combustion), kinetic energy (wind, waves, gravity, vibration, and body motion), wireless transfer energy, and RF radiation energy (inductive and capacitive coupling).

The energy harvesting from human or environmental sources has been provided to be an effective alternative."

[link to biomedical-engineering-online.biomedcentral.com (secure)]