I think the original poster was rather talking about the material settings, useable on any figure, than about ghost figure (although the one by Mapps is least toony and most scary from the freebies available around, definitely top-quality). The screenshot he/she posted shows usage of pwGhost - plug-in for DAZ|Studio, and he/she wants to recreate the effect in Poser. My only suggestion is to search freestuff for freebie P6 materials, I'm pretty sure I've seen something similar (but not identical).

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Outdated gallery over at DeviantArt

Fics at FanFiction.net and Archive of Our Own (AO3)