I am currently halfway through the block out stage of a Covenant themed Infection map. I have gone through Battle of Sunaion scrutinizing all the aesthetics and thinking about how I can recreate them in Forge. I have a pretty good idea, but if you could give me any more tips on how to take it even further, it will love you forever.
My advice is to wait until we get Covenant themed pieces. To the best of my knowledge, no released map has yet to pull off a convincing Covenant/ Sangheili theme.
DarkPrince909 (the same person that did high charity griffball court) did art for my design called Sadistic intent. Could always go take a look at that for some influence. And slammers did a pretty good looking one of a different style (might not be covie) and that one is called Sanctum. I'll leave a picture of a pre textured Sadistic intent.
Have you seen Purple Reign and that one Atonement remake? Pretty convincing Covie aesthetics if you ask me
Its gotten fckd since the updates but I thought I pulled it off very well on purporbital. Used high charity and truth and reconciliation as photo refrence