Make a template - print out a snowflake, cut it and then trace it over cardboard. Then cut that and you have a snowflake template that you can now use for fondant. You'll have to hand cut everyone though.
If you have a cake supply store, they would probably still have the holiday chocolate molds. Make some out of white chocolate. Simple and easy and fast. A little white luster dust gives them a pretty shimmer and they're much yummier than royla icing. I have a Christmas cake with chocolate snowflakes all around the cake if you want to take a look.