Brushbot

Vibration motors are found in telephones, tablets and other electronic devices. They are available in the market and really cheap:
http://www.aliexpress.com/snapshot/233098463.html?orderId=1125252124

The vehicle in this Thing moves around by vibration. Four little tooth brushes are separated from their holder and placed underneath a platform, containing two vibration motors and two AAA batteries. The motors are designed for 6-9 Volts, but they work nicely at 3 Volts as well. The battery com