Everybody loves elves, so I had a go at some possible customization subsets for the Night and Blood Elves. Please note I am not much of a Horde player, so I might have not gotten it entirely alright, but I figured maybe WoD’s Sunsworn could be used as a ‘container’ for both Farstrider and Magister options such as all sorts of tattoos and runes as they are told to be a military elite which groups together rangers, magi and blood knights. In my mind they would be to the ‘regular Thalassians’ what the Wildhammer are to ‘regular Dwarves’.
Then, when it comes to those-that-cannot-be-named, I preferred the elven racial name as I felt it could be used for both Void and Blood elves.
Lastly, the Dark Rangers are something I’d like to see added at some point during Shadowlands. 
Hope you enjoy!
https://i.ibb.co/nsqmT5W/subrace-customization-mockup-darkranger-alliance.jpg
https://i.ibb.co/9V6dWC3/subrace-customization-mockup-darkranger-horde.jpg