If this has already been posted, my apologies since I could not find a reference to it.
So, what do you get when you take a skilled character designer from Pixar, a willingness to learn how to be Maker and a 3-D printer? You get the incredibly adorable robot Mira. The design uses a Raspberry Pi and a Teensy (Could be a Propeller??) along with some face tracking software to track the users face and reacts to certain actions such as playing Peekaboo. This is an awesome example of taking what has already been done and re-purposes it for use in a Bot.