Our concept is the "Scaredy Cat" which is a cat that reacts when someone tries to touch it. 
We'd like to build a capacitative sensor our of tinfoil, but our backup plan is a Ping ultrasonic sensor.
A couple possible reactions we're thinking of:
  • Triggering a vibration motor so the cat shakes
  • Red LEDs turn on

Here are a couple sources of inspiration (and code..)
Bare Conductive: Capacitance Sensor 
Arduino CapacitiveSensor 
NOTE: If you try this yourself and you use a laptop, make sure your laptop is plugged in so the sensor is grounded! This was very frustrating but now it works like a charm! :)

Want to join the conversation? Check out the Seacoast Robotics Robot Build group on Facebook.
 





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