The Imagination Consortium, in general, doesn't really demand anything in exchange for doing jobs for other. The challenge is the reward. However, they only treat requests as suggestions, basically simply doing what intersts them and leaving the rest lingering ignored in their 'slush' pile of project ideas. They aren't really a very highly organized group, primarily existing as a social network with shared data resources.
Probably the most numerically prominent members are Charmwarpers, with their frequent tendency toward unfettered, wild creativity, but it's actually a fairly balanced group with members from various Warps and non-Warps as various specialities cross over.
The "Digital Circus" from [ZBS Audio]'s Ruby: Adventures of a Galactic Gumshoe, which among other things built huge, portable, inflatable cities.
Kindly add ultra-weird houses, insane engineering ideas, and such fitting links you know of. :)