Discovered a world generator from donjon, and being the spherically accurate generator that it is, it outputs images that wrap around spheres.
Google likes images that wrap around spheres because they're the right dimensions for Photospheres, which is an auto-awesome feature, meaning you don't have to take a Photosphere in order to see one.
So what I have now is the exterior of a fantasy world projected into the interior of a virtual world, and of course it still works inside and out (star charts can be put on spheres, the Earth can be viewed from inside a sphere, it still works).
Pretty rare that it happens (I've messed around with a few maps like this, only one has been Photosphered so far), but interesting to play around with - I can see, for example, the size of these land masses in more accuracy, without having to remember to squish the image this way or that in my mind.
Limited application at the minute, but nice to see.