Shimmer spray is wonderful stuff. I did last year's C cake with fondant (sorry Teetime ) and cut out snowflakes with Lakeland gadget, some of which I sprayed with shimmer. I'll probably do the same again this year.
I’m on a roll! Your perfect coalition

For my Christmas cake (which is in the oven as I write) I usually go for a roughed up "snow" effect that covers a multitude of sins!