En&is designed an amplifier for the IPhone made of ceramic.

From their website.

The form is designed to amplify and optimize the best sound output. the amplifier is based on a thin wooden frame that allows the object to float off the table. this in order to increase the vibration of the object and to optimize the emission of sound. designed for the iPhone is perfect for listening music without headphones, for audio conference to hear the person on the phone as live voice.

Here is a video on MegaPhone.