Here's an example of Snarlygribbly's Snow Machine script in action. Not sure what all parameters he plans on adding (e.g. for altering colour or texture). But it looks like a pretty good start, I think.

She's a miracle girl... didn't leave any tracks in the snow. ;-)

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3