(I'm still at a loss what OTO means. Sounds like a Lovecraftian conspiracy.)
See here:
http://en.wikipedia.org/wiki/Ordo_Templi_Orientis
Is GIMP a free software...
Yes, GIMP is free. I don't know how Photoshop's interface looks like, I'm using GIMP for so long... but I presume they must look alike.
Actually, the plug-in that did the little trick is a script that must be install after GIMP, but that's easy, you just download it and copy it to the scripts folder.
If running under Windows, that is
"C:\Program files\GIMP-2.0\share\gimp\2.0\scripts"
assuming you have the latest version and did not customized the install.
GIMP -
http://gimp.org/downloads/
Disregard what they say about "official binaries for Windows"... it's stable all right.
Quick sketch plugin -
http://registry.gimp.org/node/5921
Download and copy to that folder.
After starting GIMP, and opening an image, just apply the Quick sketch script. It can be found in Filters->Artistic->Quick sketch.
I used a value of 10 for the filter, but feel free to experiment.
Good luck!