Apartment Therapy Chicago looked at Werner Sobek's R128 and H16 homes:
These structures aren't available through a manufacturer; they're custom homes designed using lightweight, modular parts. The "prefab" part of these homes lies in their skillful engineering. R218 (shown above) is made from 100% recyclable, easy-to-assemble mortise and tenon joints and bolted joints, while the H16 is made from prefabricated architectural concrete...
And Apartment Therapy New York caught The New York Times' coverage of "high-style sheds":
The focus of the story is on the immediate gratification of prefab sheds ...
Prior to the New York Times' articles, Treehugger wrote about friggebods, or Swedish garden sheds:
Dorte Mandrup Arkitekter have designed a lovely little 100 square foot cabin/office/guest room prefab that is lovely to look at.
Inhabitat's Prefab Friday covered the Danish Easy Domes:
The dome offers individuals the opportunity to build their own high quality homes, coming with pre-built wooden sections, ready to assemble on either a concrete or timber plinth. Once on site, the dome houses take only one day to raise and seal, and for domes less than 50 square foot, no crane is needed to complete construction.