I get a lot of ideas from the Geekdad blog. They recently ran a mention of a project from Evil Mad Scientist Labs called Bristlebots. It's dead simple: get some pager vibrators (tiny motors with unbalanced weights on their shafts that cost about a buck each) and fasten one with a battery to a toothbrush head.
It just so happens that the girls went to the dentist yesterday and got new toothbrushes. So today I repurposed their old brushes.
If you build them, be aware that the leads on the pager vibrators are very fragile. I broke three of them. In particular they can't take any strain when you're bending the attached wired around. Isolate them from that strain with your finger grip.
Click on the image to go to the video.
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