In dgray_flashfic, members sign up at a monthly post with a request for specific characters or pairings they would like to receive a fanfic about. Then the authors will be randomly assigned to write a fic for a member based on their request, of 1,000 words or more. They will have one month to post their fanfics, by the end of the challenge month.
Membership is open, so I encourage any and all to participate. And even if you're not interested in writing, please feel free to watch this comm and comment on the fics!
Confused? The short short is this is glorified fic exchange. You make a request, and you fill one request. A thorough explanation of how dgray_flashfic works can be found here.