Some may come from KTN3D: http://www.ktn3d.com/copyright.htm Some maybe from Lemog3D: http://perso.club-internet.fr/lemog/ Some from imageafter: http://www.imageafter.com/ Those are the three resource site I use most, but then I don't do commercial work. I would hesitate to redistribute anything from the top two. KTN3D states "not for commercial use" and the terms at Lemog are a bit vague.

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire