Korean Company Mirae Plasma developed a thin film (foil) speaker technology.
Mirae Plasma created some cool looking design studies of speakers using their down to 0.5mm thin speaker technology. Korean site eBlueSun (First seen on DAPReview) published several cool photos of a Mirae Plasma Speaker dubbed MP-C100. The loudspeaker foil can be printed on. The MPC-100 shown in the photo has a lake scene on it. On the Mirae Plasma site are other product concepts including posters that are also loudspeakers. The Mirae Plasma speaker foil can also be transparent. See the company's comparison to conventional speaker technology for more details.
A foil like speaker has lots of uses. Not sure if the Mirae Plasma Speaker MP-C100 is already on the market in Korea. Casio recently introduced a LCD panel with integrated speakers. NXT Sound offers thin speaker technology since a while also.
There are also speakers made from cloth.
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