I did mean to do this last year but I didn't quite get around to it.
I've done plain and glitter backgrounds just to show different looks you could go for.
Eyeko - Rain | George - Witchcraft
Barry M - Glitter Hex
Once you have a base of your liking, you can move on to adding some white spots
With the white polish make little legs come off from the dots. Some people say snowflakes have 6 points but I have done 5, its up to you
Add some more white lines
I went on to add more glitter
You could finish it off with rhinestones in the centre of the flakes if you wanted too.