One of them is snowflakes, as in the photo-realistic ones. That would be fun to carve. Bill wants a castle in the background, like the first SH xmas card.
But not so much on the ground as in the air. I do like the edge on flakes tho.
Another thought is a b&w image with just a dab of color (tho that doesn't lend itself to snowflakes very well).
Then I keep looking at polar bears...I really don't have anything nailed down yet. ;- ]