[Gatalis]

Another option to stand out may be to juxtaposition the color of your character's skin with their tattoo so that in essence the bulk of their skin becomes the tattoo color, and the tattoos are where their natural skin color show through.

I did this with an insane, prophetic Elf I once played here on Thay and it turned out looking pretty interesting in my own opinion.

I've been considering doing this, actually.