Redditor RubberDogTurds, who is known offline as Nikki, is an inventive and skilled Photoshop artist. She frequently creates custom Facebook header images that insert her into popular movies and television shows. She gets to make meth with Heisenberg, serve as Sherlock's sidekick, and pilot the Enterprise. You can see her complete gallery here.
-via Huffington Post
I also did the "May the Fourth" one with Lord Vader choking the user.
Some years ago a template for that was provided by the official Star Wars Facebook page.