Snowfall
In 'Snowfall' category of the Wizard (Right click on Flash Object, then FlashDevlopment24 Wizard -> Snowfall Header with Menu) you can customize the appearance of the snowfall.

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Snowflakes size
The size of the snowflake.
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Number of snowflakes
The number of snowflakes in the snowfall.
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Type
The type of the snowflakes. Acceptable values are "1", "2", "3", "4", "5", "6" or "Random".
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Speed
The speed of the snowfall. Acceptable values are "Slow", "Normal" or "Fast".
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Enabled
A Boolean value that indicates whether the snowfall is enable (true) or not (false).