Thanks to Graechan (Snow Covered scm) and GnuTux (3D Extrusion scm) and GIMP devs for GIMP.

Both scripts available at GimpScripts.com
Graechan i also added a shadow UNDER the snow topping layer.
I alpha to selected the snow topping layer, created a new layer and filled with black. Then dropped it under the snow topping layer.
Then i followed these three procedures on that new shadow layer..
Blurred by 17
Opacity set to about 56%.
Then i moved it down about 7 pixels.

Here is one i made from Graechans "Furry.scm" and GnuTux's "3D Extrusion.scm"

Both XCF Workspace Files attached below.

Attachment:
3D-Snow.xcf [3.53 MiB]
Downloaded 132 times
Attachment:
Furry-GIMP-2.6-3D-Extrude.xcf [741.52 KiB]
Downloaded 129 times