Wayne and Geraldine Hemingway, designers (they were the founders of Red or Dead) and judges of Enterprise Nation's new Home Business Award, have a wonderful shedworking atmosphere, a teepee in their back garden known as Hemingway's Outdoor Home Office (or HOHO). It has two levels with a suspended communal desk on the ground floor deck. The wood comes from sustainable sources including 10 BT telegraph poles. More details at their website here and an article about it in Whatlaptop here which concentrates more on the technology they use to work from the teepee and where Hemingway says:
"I love the outdoors, and to be in touch with the environment. So I have set up an outdoor workspace at home on the south coast, which has electricity fitted, as well as being a wireless networked space. I can take my laptop there to work, and can use scanners and printers if I need to, but still be in touch with the environment outside my home. There is a similar space at the London office – a garden with wireless networking, so we can work outside on nice days."