After some inspiration from Lorenzo Bravi via makezine, built a small painterbot from a toilet paper roll, a small motor, a nut, a battery and some velcro.
The nut is taped to the driveshaft of the motor to provide the vibrations. Then engine and battery are fastened to the inside of the roll, while the outside can be covered with pens.
By being able to move the mass around, adjust the angle of the vibrations and play with the positions of the pens, various patterns can be achieved. Using pens with caps, pens with rubber ends, etc adds yet another dimension to the tool. The only thing that I need now is a large paper and a table with edges.