More than one flake style in Falling Snow 2.0?

Its that time of year again! Im making a little holiday greeting card and have a complete vector storyboard that I am beginning to animate.

Falling Snow 2.0 will work great, but I would like to use my own vector art instead of the plain circle flake in the tutorial.

I know I can easily substitute my art for the one circle…but how can I add more than one flake style to my animation?