Hipgnosis

Hipgnosis was a British art design group which specialized in creating cover art for rock albums, most notably for Pink Floyd, Genesis, Led Zeppelin and Black Sabbath. Hipgnosis consisted primarily of Storm Thorgerson, Aubrey Powell and Peter Christopherson. The group dissolved in 1983, but Thorgerson still works on album designs.

Hipgnosis' approach to album design was strongly photography-oriented, and they pioneered the use of many innovative visual and packaging techniques. In particular, Thorgerson & Powell's surreal, elaborately manipulated photos (utilizing darkroom tricks, airbrush retouching, and mechanical cut-and-paste techniques) were a film-based forerunner of what would, much later, be called photoshopping.
Another Hipgnosis trademark is that many of their cover photos told "stories" directly related to the album's lyrics. Since both Powell and Thorgerson were film students, they often used models as "actors" and staged the photos in a highly theatrical manner. Hipgnosis covers rarely featured artists' photos on the outside, and most were in a gatefold cover format to provide ample space for their slickly photographed tableaux.
Many of Hipgnosis' covers also featured distinctively "high tech" pen and ink logos and illustrations (often by graphic designer George Hardie), stickers, fancy inner sleeves, and other packaging goodies

http://en.wikipedia.org/wiki/Hipgnosis