On the first day of Christmas my true love said to me "Can you write a ficlet about ..."

I love the tradition of writing festive fics for each other and responding to requests from people on my flist.  I want to reciprocate, but there won't be time before Christmas (don't even mention the need to make a cake) so I've decided that I will produce a drabble/221B/ficlet for the twelve days of Christmas, starting on Boxing Day and finishing twelve days later on Twelfth Night.

So if anyone would like to prompt something, please comment away.  My main fandoms are Sherlock (BBC), ACD Sherlock Holmes (Mouselet included), and Lewis.  I've even written a Kirk/McCoy ficlet.  BBC Robin Hood is also a possibility and I've just watched series 7 of Spooks.

Two words of warning.  My muse resides in a parallel universe, so there's no guarantee of the direction I shall go in.  Also, during my posting time frame, two episodes of Sherlock will air.  It is therefore quite possible that anything I've written will be thrown out of canon by that time.

So, please let me have your fandom, character(s)/pairing and prompt.

ETA: Much to my total surprise I now have 12 prompts, so all days are covered.  Thank you, flist!