There should be tumblr appreciation days.
For example, the fantastic Alice X. Zhang -- whose marvelous postcard graces the upper right corner of this blog -- has many places you can enjoy her work.
Her Sherlock in Pink rivets me. I want it. I must ask her about Galaxy tablet skins. I didn't see one in her shop.
Alice introduced me, through her tumblr, to blue, and blue kindly has a list of Sherlock fan artists.
A great Sherlock (phone problems) piece by blue -- yes, I can totally see Sherlock complaining exactly this way. Even though he can blinkin' hack into multiple phones at once [cf., the Yard scene in Study]. And blue sells Sherlock buttons!!! Well, sometimes.
Perhaps this is John's revenge on Sherlock with the pink phone?
Since I found it via blue's tumblr, here's another Johnlock: Two Doctors, A Nurse, A Detective, and A Scot. Crossover fanfic. It was very sprightly -- and alas for me, then the shipping turned up. Oh well.
I always knew the Doctor was a meddler. He's not changed. Funny about that. :D