I think I may have posted this a long time ago
but honestly....I think not
anyway, without further ado, try drawing something with the mouse
watch it fade after a while
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Wow, it's a very simple but effective... effect.
I could easily see it being used in a silent-hill-ish game or for procedural vines on walls.
Oh and it crashes .99.3
\o/ it's bug report time!