"blue snow" is more commonly seen in glacier activity but every once in a while, ice pellets, dense snow, etc can cast this blue tint. A thorough explanation is seen here: http://www.gi.alaska.edu/ScienceForum/ASF7/773.html It's not only seen on Mt washington or parts in the far north/south, It was even recently seen in central NY: http://www.9wsyr.com/news/local/stor...zTtJF5bXQ.cspx. If you can get out climbing in the Whites soon, you can see it even in Pinkham Notch as I saw yesterday as I shoveled my car out. It was everywhere yesterday as well once we got below the cloud base and the snow cat bladed the edge of the road. The key is to look for it. It's not common but currently it can be witnessed.
Staff Meteorologist/Night Observer, KMWN (Mt Washington Obs., NH)