Answer:

>! **COLOR** in Braille (⠉⠕⠇⠕⠗)

Explanation:

>! The snowflakes appear to be made of arrows pointing to their centres (as noted by @RonchenLuo) suggesting that we should focus on the centres (as suggested by Hint 1). Indeed, the centres form the dots in Braille script (the one with 3×2 grid of dots for each letter) which then spell the word COLOR as shown in the image below. I am still not sure what the relevance to Christmas is.[![color][1]][1]


  [1]: https://i.sstatic.net/traMW68y.jpg