Build a car hacking spy device to remotely read and send CAN commands and track GPS location. All based on open source software/hardware.
Dog harness + computer vision + cellular network. Tracks dog biometrics and object recognition sending SMS notifications.
Mobile device that can be setup at a location to check wheter unwanted devices like Google Glass enter the area and warns via Twitter.
Remote monitoring of deployed field experiment equipment with IR detection and image capture.
Take the worry out of renting with a portable security monitor for belongings!