I do: 001 by stefsmif_velomaniac, on Flickr
Thats my 'HalFat', 26" DH rims front and rear. Rear tyre 26 x 2.5", front tyre 26 x 3.8".
Absolute hoot to ride, it goes over or through stuff you usually have to go around. Not as good as a full fat bike from a float point of view but the rear tyre sinks enough to grab purchase in the gloop.