Exactly, till this day we have no explanation for the Tauren markings, nor the ones added, would be nice though. And yes, I definitely want Rommath and Alleria type tattoos on blodo elves, especially mages and Farstriders - at least the option.
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Tanaria I think warlock blood elves, after Rommath would be an excellent place for Rommath type tattoos, and a hint to the Illidari who use arcane tattoos to better control the extra power and demonic interference, they could even generate a new expression , a unique one for blood elf warlocks that is a combination of illidari teachings, blood elf sun magic and traditional warlock, so not your classical warlock.. afterall, most blood elf warlocks developed in their time with Illidan anyway, so in a sense they're probably the caster version of demon hunters in actuality than your traditional warlock.
And for Alleria and the Farstriders, I think void elves and blood elves hould have those but
1. Distinctly different patterns for both groups. (like this star glowing power "tattoo" on Tyrande is a different pattern to the arcane ones on the nightborne)
2. Distinctly different colours for both groups. (blue, purple, grey, silver for void elves, red, green, black and gold for blood elves)