I can't find pics online, but I have a Seven Knightly Virtues T-Shirt. There's a Seven ? Sins T-Shirt to match, I don't recall if it said "knightly" or "deadly". A vendor at MD Renn Fest last year (one of the armorers, but only had jewelry/helms) noticed the shirt and said he has the matching opposite.
It's interesting they didn't take the "exact" opposite to the knightly virtues and drew more of a parallel between them. The seven knightly sins almost reads like a character definition for the stereotypical black knights.