I say, go for it! a 101 crash course on tattoo design for those of us who arn't pationate enough to go out there and buy a tattoo magazine.
Tattoos have everything to do with fantasy; they're mysterious, exotic, worn by many characters in great fantasy illustrations like the cover of issue 15, they most often have tribal or fantasy theme to them and can give quite an aura to a character. In addition, I don't think we ought to spit on any new aproache to creativity and tattoo's limitations and medium forced the artists of this domain to be exacly that: creative and go out of the beaten paths.
You have my vote and support with this idea, I'm quite curious to see what kind of workshop we'd get out of that. I don't know zits about tattoos, but I always wanted to be able to design some for my characters instead of just copy\pasting other's.
-Let us take over the world with largely exagerated facial expressions!-