Blender Snow Scene

Hello.

Recently I’ve interested in winter scenes, so I’ve tried to make snow.
I’ve done Andrew Price’s tutorial, but it doesn’t look realistic enough.
I’ve been searching for more than a month after a good snow tutorial, but I haven’t found it yet.

The elements which I need to create are:

  • Snow covered trees
  • Realistic snow on the ground

Do you know how to make these elements?