well, the terrain is generated in World Machine, (very tough program to figure out) then I insert the height map from there into world painter and edit map (snow, stone etc.). the screenshots are made in magikavoxel (the map happened to be small enough to make into a schematic using mcedit) I usually use chunky to make renders.

haha, but sovngarde...its different. You have pictures of it, but not really of valhalla. But I agree Sovngarde would be awesome, too.