Ah, I converted that myself a few years ago as part of a SS gift. The Dark Brotherhood was my favourite faction in the game. Unfortunately I didn't convert much of them, but I do still have the textures, if you think you can make use of them. Just give me a shout and I'll upload them as well!
In any case, here are the tapestries I did convert (picture links to Mediafire):



Enjoy! :)