Very nice, I appreciate you taking the time to share this MTMO, once I'm done with the other mini-tut I'm putting together I'll have to play with this a bit. I didn't recognize the names of some of the filters you mentioned, but I think I can figure out how to emulate something similar in GIMP. Who knows, if a better method emerges, perhaps I'll go ahead an re-write this tut; giving you due credit of course.

Cheers,
-Arsheesh