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Hey...I actually ran in to the same problem yesterday--I bought my mom a macbook for xmas and wanted the "wow" of snowfalling across the desktop when she started up. Backlight would't do it.

I found an alternative called QuartzDesktop--appropriately titled and exactly what we're looking for!

Merry Happy ChristmaKwanzaRamadonakahSolstice.
 
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