You know, most of it doesn't look like anything you couldn't do with a little extra time, and probably with very little money. Quite a bit of it seems to be nothing different than anything you might find at a hobby shop, but some of the photos seem to have been quite obviously either digitally touched up or a camera trick.
By "Camera trick" I mean there's ways to use lighting to make an effect appear that isn't there or is completely different from what you see when looking at it in real life, this seems to be particularly obvious in the volcano and forest fire images. In fact it's something I discovered myself when building up and painting my Skaven.
For example, this is something I put together for a painting competition:
When I first started taking pictures of it, it was being completely whited out by the camera and the light. I discovered, quite by accident really, that if I put it in shade with the light source at an angle above and slightly behind it, I could make it appear to glow as it almost seems to in the picture. I actually ended up digitally removing most of the "glow" effect for that picture because I felt it would change the outcome and possibly give an unfair advantage.
Don't get me wrong, the terrain is quite excellent, but it doesn't look like anything superhuman. If most people looked around their hobby shops (anywhere that sells train hobby supplies) it wouldn't be hard to make that.
Of course, I played at quite a few hobby shops where we gamed on simply flocked and painted boards while two feet from us were shelves and shelves of model train terrain supplies, so I guess people just love painted foam.