I got one, a shell you can put your phone in, so you can slide your phone around your desk AS your mouse. It can provide vibration feedback, alerts, sounds, etc. It can use the macro lens and the IMU for tracking its location across the desk. Would also serve as biometric auth for websites.

Prior Art for

    G06F 3/0338 - Computer mice, trackballs or similar devices for computer control
    G06F 3/041 - Digitisers using touch-sensing
    G06F 21/32 - Biometric authentication

See, you can have peripherals tha