Adding snow to tree branches and leaves

I made a few evergreen trees in Blender 2.65 for a Christmas scene I’m working on. I used the Tree Add On in the User Preferences to make the trees. I’m trying to figure out how I can add snow to the trees to make it look like there is snow on the tree branches. Could I paint snow on or would Dynamic Paint work for this? Does anyone have any ideas? Thanks for any help.

I’ve only been using Blender for around 4 months now and I couldn’t find any tuts about adding snow to tree branches.