As someone from a country where it basically never snows, ever, except on the tops of like 3 mountains for two months of year, snow's always been this exotic, magical thing to me. I didn't even see it in real life until I was 15. As such, I've always found snowy levels in games to have a certain fantastical charm.
What are your favourite examples of levels/worlds/stages/areas in games in the snow or ice template, and why?
Same reason I love desert levels :p