I used a modified ATX power supply, a 555-chopped MOSFET pulled from an old monitor, and coil made from magnet wire salvaged from a blender motor.
The transmitting coil was fabricated by putting some nails into a peice of wood and wrapping to get a consistent shape. When powered by the driver it generates an alternating magnetic field which can picked up by other nearby coils.
Throwie #1:
A a ferrite-core inductor, a diode, a capacitor, and LED. Half-wave only so it has to be right-side up.
Throwie #2:
An RF choke from a vacumn tube oscilloscope, and two LEDs. Rectification is by the LEDs, so it isn't polarity sensitive.
This spider has a choke for an abdomen and the legs make up the bridge rectifier.
Throwie #3:
A coil of hair-thin magnet wire with a diode, and LED. Polarity sensitive.
Throwie #4:
Space ship with bridge rectification from quad 4148 diodes. Very effecient b/c of large receiver and full-wave rectification, works in almost any orientation.
Throwie #5
Spider has choke receiving abdomen and the legs form a bridge rectifier. Four SMD LEDs for eyes in series to cut the voltage some.
Works through paper, plastic, thin metal, etc. Magnetic fields are not stopped as easily as electric fields :)
Here's a clip on the throwies in action:
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