I'm working on creating footsteps in the snow.  So far I have one footstep.  (yippee)
This whole thing is based upon the thicksnowtest.tgd created by smoggy at 
ashundar.com.
footstep.jpg - the first footstep
footsteps_node.jpg - the Shader nodes I used to create the footstep in the snow.  
Note that I tried to make another footstep, but am unable to see a way to have two Compute Terrains going to the same planet.  There must be a way.  I just haven't figured it out yet.  You'll notice the second Compute Terrain just hanging around waiting to plug into something.  Anything.