I would like to mod/eliminate the Geth 'Hunter mode' HUD, as it makes my eyes bleed. I am somewhat familiar with the Mass Effect 3 file structure, but am unsure as to where the HUD images are stored and how to alter them (if possible).
This could be a bannable offense, but given Bioware's effective abandonment of the game at this point (and their general statement of not caring as long as it wasn't a massive advantage over other players when it comes to modding) they don't really seem to care anymore (hence the reason we see modded maps/gamemodes in public lobbies, things like credit reward hacks, zombie mode, etc.)
While I don't personally condone doing mods like this on a non private server (Here's a promising project for that if you're interested, no bans and no being tied to the official servers once they're shut down, which is a risk given the small community size nowadays), here's a link for a basic texmod tutorial for replacing the texture once you've found it.
As for finding the texture to use, luckily you don't have to! Someone on the Bioware forums already made it! Assuming it works, my game is uninstalled right now or I'd test it for you, here's a link to the post in question. Also, here's a direct link to where it was hosted on mediafire and here's a version that has the triangle indicator in the upper right corner to help you know it's on if you prefer that.
(If you're still playing, this is a rather old post after all...)