Interesting stuff, thank you.
I had a friend of mine tell me that there was a way to do tattoos that did not take up an item slot. It was just like making a magic item, but was at double cost, less the cost of the base item. Like a tattoo of protection that gave +5 to ac would cost 50k as opposed to the bracer's which would cost 25k.
Anyone have reference on something like that, I'll check with him and see if I can find it.