Use a joystick motor rumble to stir small paint cans

Step 1: Tear Down

tear down, strip and gut your joystick, salvage all what you can (potentiometers, switches, etc) and get the, usually 2, rumble motors.

Step 2: Connection

Connect your motor to a battery, usually 5v (the one in the pic is a worn out 9v one)

Attach the motor to the paint can and complete the connection to the battery or switch on

Enjoy your paint stir, not shaken

pfred2 method? (at least what i understood from the commentary)