Adafruit 9-DOF IMU Breakout
This is a combination accelerometer, gyroscope, and magnetometer. It is noted as acceptable for motion tracking. I could possibly use this in some type of motion tracked object such as an instrument that is played by music, or a device that uses motion to decide how to play music. I could make a ball that always lights an led that is on the top of the ball. I could make an object which screams when it is falling by having it know when no gravity or little force is present (as in during a freefall). I could make an object that vomits when it is dizzy by using the rotational sensing from the gyro. I could make a robot that is scared of magnets and runs from them. The possibilities for a 9DOF IMU are endless. I think it would be most interesting to make a small bot that screams when falling, runs from magnets, and vomits when it gets dizzy. To me this is interesting because running from fears, screaming, and getting nauseated are very human things to do which makes it odd and unnecessary for a robot to do them. This would be one step closer to robots with feelings or Skynet.
VCNL4000 Proximity/Light sensor
This is a proximity sensor for small distances. I imagine using it for making different tones based on how far your hand is held over it. It could also be incorporated in a light which turns on when your hand is near it, but changes hue based on how close your hand gets to it. It could also be incorporated with an electromagnet to accomplish levitation. The magnet is strengthened when the object is too far, and weakened when it is too close. The two ideas together would be interesting to me because levitation is amazing, but levitation projects I’ve seen don’t incorporate interactivity.