As a 
main, i am annoyed that DIana still only has 2 skins despite the fact that she was released almost 4 years ago. I would like a skin with a bit more zest and personality than the current available skins.
I would recommend a Blood Moon Diana, as legendary skin, with the idea that she is above the rest of the Blood Moon skins. :D
Riot please take action; you will make many people happy.
They are working on a Fire Diana skin atm :)
Also this:
http://boards.na.leagueoflegends.com/en/c/story-art/Nvpy9X3c-fire-diana-skin?comment=0004
There's lots of work between saying a skin is going to happen and it being completed. Sure we could hammer one out quickly, but would you really want a bad Diana skin? Here's all the parts a skin has to go through before it's complete -
Concepting Modeling Rigging Texturing Animation Visual FX Sound FX
And then all of these different pieces need to come together and not have any bugs in game.
Each one of these things can take a number of weeks depending on the scope of the skin, and some things can not happen until other disciplines complete their work. Be patient. It's coming, and it's also pretty badass.
It is here!!!
