The Yorozu Audio Sound Revolution Kit from Japantrendshop allows you to turn just about anything into a working speaker. Basically, “all you do is place the vibrating extension onto a surface with the included adhesive sheets, plug in your audio source, and have an instant audio speaker.” Product page. Video after the break.
Vibrations can go a long way, especially for the transmission of sound through material. Now you can harness that power for a creative and useful purpose.