Have seen this on my friends page, so am reposting the link here: Rewriting History: A Comment Fic Meme
There are some very interesting prompts there (helsinkibaby , there are some Anne ones!) and a couple of good fics already (that's a link post for later!)
Also, I've never mentioned it on here, but i do have a tumblr, where I mostly reblog picspams and pretty pics from other users. Link is on the sidebar if anyone wants to check it out - there's a tags page where you can find stuff easily rather than wading through the whole thing as well.