curious about collaborations

[ratcreature]

Are there any forums or communities for organizing author/artist collaborations that are not Big Bangs (or Reverse Big Bangs)? Like say a notice board where authors announce describe their WIPs and express an interest in getting a cover made or illustrations or any number of things (say a pretty map for your story with a quest or other world building stuff), or artists can post what they'd have an interest in illustrating or maybe propose their project ideas that would need an author as well as art, and then people could comment and find each other?