Every Friday, we pick 3 random lines from chance_2_buy_lunch.scss (and another 3 from chance_2_buy_lunch.coffee) and the writers of those lines have to buy lunch for the rest of the team.
I'd argue that if devs shame each other all the time, something about your culture is broken. Why? Because the normal response to shame is to want to hide it. You see that in the description of shame vs. guilt societies in the links you provided, where "Shame cultures are typically based on the concepts of pride and honour, and appearances are what counts, as opposed to individual conscience in guilt cultures." Shame is positively correlated with depression, addiction, violence, aggression, bullying, and all sorts of other nasty stuff; guilt is inversely correlated with all of them. [2]
Regardless, I would agree that guilt.css would have less of a deterrent effect (think chocolate), and illustrate the premise more effectively.
You went slightly overboard there I think.
It's possibly called shame because the style sheet is public, _it shames the author_.