Nice, but a little zig-zaggy. I found that using 2 for the drift value and a separate MAX_DRIFT_COUNT of between 4 and 8 seems to produce a pleasing effect.

edit:

I've attached a new version inspired by Keith's drift changes, which uses random values to make the drift less mechanical looking.

Nice much better, I still prefer white snow to cyan snow though :)

yeah, I was in two minds on that one. I think I went with the Cyan because there's already a lot of white on the Sleigh/Banner.

Anyway, just keep away from the yellow snow an it's all good! :)

Ok, done playing with this now.

Colour of flakes back to white to make keith happy, and g/s/1-9 keys now provide feedback messages when pressed.

You're so good to me :)