Yes, it is. I was looking for a port of my favorite toy, but didn't find any.
So I took the graphics from Rick Jansens Xsnow 1.40
(http://www.euronet.nl/~rja/),
went to the kitchen, got me (Nikolaus Klepp, dr.klepp@gmx.at) a mixer, ice ... and here it is:
the first XSnow port to JavaScript!