With some snowfall over the past week, I've experimented with a few ideas which work out pretty well:
If it's snowing, set the flash to forced-on. It will light up the snowflakes, making them visible in the picture. The effect is much better with a brighter flash, such as a DSLR add-on flash.
Try taking photos outside in the dark with the flash. As the snow is white, the flash's light will travel further and can give some interesting photos, especially if it is snowing.