Typhonics SP-Tiles
"What looks like an amazing set of speakers on a living room wall actually turns out to be a series of sound dampening foam tiles. The SP-Tiles from Typhonics are designed to pretty much do the same thing as the acoustical tiles you'd find on the walls of recording studios and other sound quality critical venues, but look a bit cooler doing it so you'll be less apprehensive about using them in your home. They attach to the walls with good old-fashioned double-sided tape and a special wallpaper, which I assume is to protect the wall's finish if they're ever removed, and are available for about $54 (¥4,935) a piece."
[Via]