Arch Daily recently covered Villa Grow from Sweden:

villas have a common basic unit that can be extended by adding new modules. The angles at the end of each unit allow for different orientations, on which you can have a linear house, a patio house, or an organic layout that opens to the landscape.

More information:

model: Villa Grow

designer: Kjellgren Kaminsky Architecture

manufacturer: Emrahus

available: United Kingdom and Sweden

size: 645 - 1,722 sf (60 - 160 m²)

Check out their promotional video. (3:59)