| Malikor |
I was going to say because they are one shots like scrolls, but now that I look at the tattoos (if you mean the kind gained through inscribe magical tattoo( and they work as slotless wondrous items). The only reasons I could see that they could not, would be due to the restriction: must be an amulet, ring, staff, wand, and weapon.
I think I would allow it, on the uniqueness and novelty alone! Varisian Tattoo is an ALMOST must in this case ;) And the tattoo would have to be of masterwork quality (of course that is free when you start with it).
A pity a tattooed sorcerer can't get a bonded object......