Anime's usually drawn pretty cheaply, right? Lots of long scenery shots and dull pans / zooms wherever the animators can get away with it. Maybe half of each episode is real animation, not including straight footage reuse for recaps and beginning / end credits. On top of that, it's almost all on twos or on threes, meaning an average second of real animation only contains around 12 distinct frames. Any given episode will contain fewer than 10,000 unique frames of character art, possibly by a wide margin.

Meanwhile, original fanart of anything and everything is available by the pound on 4chan, 2ch, Gelbooru, and Danbooru. Gelbooru alone has 70,000 Touhou pictures, for fnord's sake.

So why haven't we seen any perverted efforts to reanimate a series? Surely there are enough artists online who'd each contribute a scene (a hundred half-traced frames, in practice) that we could slap together a whole-series edit with Haruhi or Shinji in the buff.