I know this idea was kicked around a bit, although I'm unsure where it is at this point. But, while perusing the web, I discovered that a sequel to Wasteland was being made by the original creator. Visiting the site, it appears that they have a crowdsourcing system in place to collect and compensate artists for work that make it into the game. You can check out the link here:
http://wasteland.inxile-entertainment.com/unity