The Crows seem to take an Assassin's Creed approach to thing, but with extra zest. They practically run the country. They allow themselves that theatricality, and use the fear and respect that being an obvious Crow brings.
Personally, I suspect a few flamboyantly assassino Crows would provide excellent cover for a disguised assassin to do the dirty work. 
I like the headcanon about Zevran's tattoos.
I think it's pretty typical Zev behavior to treat something very seriously as something equally frivolous. (I need to do a Zev-Romance playthrough again, me thinks.
) I think he mentions something about them being popular among the Crows. Not that they're Crow tattoos, necessarily. I'm picturing more like the scene in Starship Troopers where the Airborne Infantry grads all get drunk and get tattoos together.
Also, as for tattooing your followers as kind of a stupid decision, could we send that in a PM to Lord Voldemort? 
Yeah, never discount waking up with a tattoo when you're drunk, especially with a bunch of fellow soldiers.
I have a similar headcanon for the story behind Carver's mabari tattoo that he got at Ostagar, that he got it his squad enjoyed a night of heavy drinking with Cailan, after the King had bunked off yet another war council meeting with Loghain to spend time with the soldiers in the valley, which was mentioned in Origins by the soldier on the bridge.
As for Voldemort, his leadership was filled with stupid decisions, the tattoos being one of them.
That's also why the most successful and dangerous Death Eater in the entire Harry Potter series was Barty Crouch Jr, because he was operating independently and using his own tighly-knit plan, rather than following one of Voldemort's typical plans that suffer from complexity addiction. Actually, Voldemort going off-script and deciding to monologue in the graveyard, rather than kill Potter immediately as Barty had assumed (since it would have been the smart thing to do), was the only reason the books didn't end at number four.
Ahem... yeah, Dragon Age isn't the only fandom I overthink.
