His-Doctor and I were thinking of doing a traditional style (so no pairings, AU etc.) based around one of ACD originals. We thought we'd try an modernize 'The Cooper Beeches' which is a pre-fall case they do together. Only thing is we need a third character, Miss Hunter, a young nanny who comes to Sherlock for help. She's got quite a big part and you can pretty much do anything with her personality etc.
We also thought we could maybe have John having a little crush on her... so there may be an opening there.
If your interested please pm me or reply on here! If you haven't read 'The Copper Beeches' there's a link here (it's only like a 30 min read at most and well worth it haha)- http://arthursbookshelf.com/adventure/doyle/complete-holmes.pdf (page 263)
Cheers!