Sculpted Walls

These sculpted cardboard wallpaper tiles from Nomad would make any room look distinct. They're just weird enough to make someone go, "Huh?" when they walk in. They're bio-degradeable and come in a number of colors...

And can be put together in different configurations.

A pack of 12 1'x1' squares costs $32, which aint bad for the level of impact you get.
I've been struggling for a while to find some sort of sound-diffusing wall-covering to put behind my stereo (it makes it sound better). A lot of audiophiles will cover their walls with $200-$300 specialized boards... or bubble wrap on the lower end of things. But bubble wrap taped to the wall looks like crap.

This looks awesome.