I've tried a couple variations with only moderate luck.  First link is duplicated tree with trunks and branches grotesquely morphed per Dimitrov's Bryce tutorial here at R'osity. 

The second is duplicated tree with snow mat applied per Aymelia suggestion.  The background trees are duplicates and white deciduous(sp?) leaves applied . 

 http://excalibur.renderosity.com/mod/gallery/index.php?image_id=961245

http://excalibur.renderosity.com/mod/gallery/index.php?image_id=1100653

If you are fairly new to Bryce as you say, you will discover a bug in the tree lab when duplicating trees and placing them close to each other.  I hope you can do better than I did.