Thanks for the vote of confidence, james. Yep, that's on my list and thank you for not posting anything overtly identifiable. What I find interesting in this person's frequent use of the cross/circle symbol is that it all pre-dates Z's activities and, like Z, he uses it in a multitude of contexts. It's used as a film leader, gunsight (in movies about the Kennedy assassination), dream catcher, mandala, lightbulb filament etc.
Here's one without any overt Z connection but one I find interesting and one of many that intermingles violence and female sexuality (the nail driven into the buttocks is a nice touch...). It's a representation of the infamous 1947 Black Dahlia murder case:

Here's how he describes it in a 1973 interview:
Interviewer: "Well there are a lot of things I don't know about you."
(This guy): "I have a lot of stories to tell."
Interviewer: "About the world. You mean people."
(This guy): "No, it's another art form. I might project or assume the character of a personality. Like the person that's producing this is the Black Dahlia, and it's also the person that killed the Black Dahlia. Instead of being individual actors before me, I'm using objects and characters that aren't defined as separate performing characters. Mental attitudes. The relationship of victim to assassin. Positive to negative. But they're both lovers. I mean, the Black Dahlia is loose within the structure of the attack of the man who had destroyed her. It's all basically love or passion that's been distorted and altered. Changed because of social or cultural imposition. But what I would get back from the culture of this society would be hate. Which, you know, isn't it at all..."