Some research on Inflatable Sculpture:
The TV is by Flores McGarrell, who went to SAIC. It seems this school is stalking me lately. McGarrell is also on Art :21, and apparently, was killed just recently in the earthquake in Haiti.

Inflatable Ego?
Other things of interest:
Instructables: Making 3d Objects
A Word of Warning: An Accident
As for materials, it seems, plastics and polyester. As always, it’s an ongoing process, more to come!