Another potential Project14 topic is NFC/RFID - this low cost technology must have some interesting maker applications.
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This may be the wrong term for the topic but "Energy Harvesting" be it solar, vibrations, heat, etc. and associated storage such as rechargeable batteries, super capacitors, etc. It would also include low power microcontrollers, sensors, and techniques.
Another potential topic is sensors - design a sensor or use a sensor in a control system, or do something interesting with sensor data.