I might be willing to invest in a mug or tshirt.
As for design, here's my two cents for shirts, etc:
"NNGO" horizontally in whatever bold font with the rest of the word (Nox Noctis Gentis Obscurum) running vertically off of the first letter in a smaller font. People will be WTF anyway so might as well. It sounds nifty. ^_^
and put it on the back of the shirt, for the love of Jah! I don't need to draw any more attention to my tits.