The official images are currently anything produced by
Kiva128, including these from the contest:
Edit: Images removed because the external hosting service was "upgraded" in Jan 2014.
This means the images were deleted. What remained here would only serve as an advert so has been removed.
However, if we see other fan-works that are particularly good we might include those in the "official" set, if the creator is happy for us to do so.