If you take a look at the following article, it discusses a number of innovative designs in the realm of flat-pack furniture:

More Creative Furniture for Cramped Urban Living: 20 Pieces of Ingenious ‘Flat Pack’ Furniture

At the bottom it takes flat-pack to its logical extreme by showing a photo of a flat pack house. Which brings up the obvious question: Has anyone ever tried selling a flat pack house? In fact they have…

The first example is the HaitiHouse FlatPackHome, which assembles in 15 minutes but is about as ugly as housing gets:

If you would like something a bit bigger and more stylish, there is the Shack-in-a-Pack:

It assembles in a week. More info and pricing is available at Shackinapack.com.au

One level up from that, this flat-pack house took about a month to assemble and finish and can be customized to almost any size and shape:

More info: Livinggreendesignerhomes.com.au

Here is a flat-pack house that is made from hundreds of plywood pieces that interlock with no need for screws or nails. This is a fascinating video simply because it seems like it would be impossible to build a house without fasteners:

One final option for developing areas, although it is not clear where the floors and siding came from:

Flat-pack shelter housing solution

There are also flat-pack storage units to put next to your house. Three examples:

[[[A different way to build a house #52 - A different way to build a house #51 – An inexpensive home using recycled wood and natural materials]]]