I use this account for short story writing (the emphasis is on short so don't be scared away!) There's some original fiction there in amongst a fair amount of Harry Potter fanfiction, all Marauder based, of course. And I think it's all focusing on Sirius and Remus rather than James and Peter. There's a lot of slash stuff there :/
If that doesn't appeal then sorry. You don't have to read it (: but don't be scared by the geeky HP stuff, because as I said there is original fiction there too.
I will start reading and criticising other people's writing soon, probably tomorrow evening (I wont start now as it's quite early in the morning- I should be asleep by now).
I bid you adieu (: