Thanks guys. Well, it started out as a simple test for a snow shader, hoping to include the sparks into the overall reflectivity (you know, some sort of combined soft/wide and narrow/small/hard roughness mask), but in the end I had to add extra reflections by tiny fake stones (used as mask) and distance.
And then I thought; let's add some stuff....
I like the crop as well, that was the original size of the whole thing.
Snow clumps I quite quickly made in ZBrush; just importing the shrub and Dynameshing the leaves, some pulling and inflating, remeshing, voila. I still need to do a test with subsurface methods, hoping to get it to work in SR.