how about group architecture - everybody in sketch up - has their own block or room?
see also crowdsourcing in wikipedia
I did write down eight "benefits" for crowd-sourced art on the internet:
The call for submissions can be free and be addressed to huge numbers of recipients thos on occasion the unknown genius will happen upon the project that unlocks that genius
The process of receiving submissions by use the internet to upload and share for free
The possibility of overlaying or collaborating and editing using computer applications - perhaps even in real time
Unlike traditional paper media, you can edit and edit edit and not spoils the work
Doesn’t go out of print, always available - not stuck in a house somewhere
Can share globally immediately - let a 100 critics bloom
Utilize the wisdom of crowds??
Make many people happy - everybody’s a winner