Slap a speaker onto any wall with Sonic Impact SoundPads
These diminuitive, four-inch soundpads can be slapped to any surface, turning anything you affix them to into a speaker. Obviously, the acoustics will vary depending on whether you smack them onto a wall or door, and I suspect sound quality will be marginally crap.
Still, snazzy. But the concept really falls over because the speakers are wired. You might be able to deal with oomphless sound if you could just easily put these on your ceilings, but you still need to worry about cabling it.
That's a lapsed opportunity, but for $17.99 for a pair, these are cheap enough to pick up in the chance you one day have a use for them.
Sonic Impact SoundPads [Thinkgeek via Technabob]

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Forget walls, stick them on large plate-glass windows.
I thought of this a while ago. I was so excited that I may have thought of something unique and cool that would make lots of money. This continued until I saw this product on ThinkGeek. Oh well, still seems like a cool product, not sure how well it works in practice though.
They'd also make fine contact mikes for making crappy recordings.
would be better if these were wireless receivers so you could slap your existing speakers anywhere ..
Brilliant for sticking to the ceiling and blasting music whenever my upstairs neighbor starts dancing, or bowling, or grooming elephants, or whatever it is she does up there.
John, although they will probably sound quite bad, the concept's probably not quite as bad as you make it sound. From reading the blurb and some shaky inductive logic I've reached the conclusion that these aren't supposed to work on ceilings or walls, and that the wiring issue isn't that big a deal because they play through the surface and not back on themselves. Think sticking them behind a picture, on the underside of a table or to the inside of wardrobe doors instead.
They've been around for several years, and they sound much better than you would think. Not as good as the Klipsch speakers in my living room, but pretty good in remote locations or connected to an mp3 player, laptop, etc. They sound better if you use them with the unbelievably inexpensive little Class T amplifier that Sonic Impact manufacturers (or, at least, used to manufacture). They're very versatile, and I'm surprised their products haven't become more popular. (No, I don't work for Sonic Impact.)
Or, how about this: slap them on your windows when you have a BBQ in the yard--instant outdoor speakers?
This isn't a new idea; the last time that I saw their predecessors was in the bargain bin at Office Max.
How about sticking them inside the walls? You could use 1/8" drywall for that area, or some acoustic friendly material that when painted becomes indistinguishable from the surrounding regularly constructed walls/ceilings.
For example: Build the worlds first 7.1 home theater shower stall! With a plasma TV embedded behind waterproof glass of course. Also available in sauna or crapper/tub/sink versions.
I wish to attach these speakers to either side of my chest, defibrillator-style.
Get a big sheet of metal and attach these and some contact mics. Ghetto style plate reverb.
These have actually been around since the 60's in the form of Rolen Stars. David Tudor used them for his piece "Rainforest." Those actually work better when they're screwed into the surface when possible. Those costs about $50 a pop though.
Best of use of these speakers thus far (and it's 2 years old):
http://www.instructables.com/id/Bike-Stereo/
Mobile stereo on your bike using sheet metal!
Bike Stereo:
http://www.instructables.com/id/Bike-Stereo/
I've had these for a couple years, with the above mentioned t-amp. I have them on the back side of some sliding closet doors. Backs of pictures, posters or even cardboard boxes work pretty well. They sound pretty good.Most folks that come over are surprised by the sound coming from my closet.
Anyone remember the P.O.S. that was (actually, by some feat of magic, is) the Soundbug? That thing was (I keep referring to it in the past tense, out of sheer hope) completely made of fail. I've heard Rolen Stars, they sound okay. These things are cheap enough to be interesting, at the very least.