BEAM Single and Dual Engine Vibrobot
BEAM Vibrobots use pager motors to move. I used what's known as a BEAM "solar engine" (Type 1 "FLED" variety), pager motors, solar cells, paperclips, and some heat shrink to build a couple of Vibrobots this weekend.
httpvh://www.youtube.com/watch?v=wx7zZzp_RoU