So you can customize your character with tattoos or fur colors for Taj or whatever. I'll let Anewbe work out what he wants to whitelist other than what I did already.
The icons are sliced up with the HumanScissors program I wrote, so they are per-organ. So, lop off a limb, put it on someone else, they have the tattoos and whatnot. It's part of DNA so it comes with when cloning.
They are defined in the normal sprite_accessories file and the icons are all in markings.dm in the format of "markingname-organtag" so if you have a marking that spans both arms and torso you need "thatone-torso", "thatone-l_arm", "thatone-r_arm" icon states.
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