how would i do this?

[junior linden]

what is even this

[warm flame]

One of minecraft secret settings..

That alternate what you see, distorted images and color mixes

[junior linden]

What i would think of:

1. Custom Font Texturepack
   A font texturepack which replaces "a" (or something other idk) with that image
   and then that letter is titled on u

2. Spectationg mobs
   You know when you enter a mod in spectator, you see it's POV? (Like if u enter a creeper in spectator then everything is green)
   Maybe it's like that and it makes is so everything is deepfried or smth like that

now, idk is the 2nd can be done with skript (i think no) but it's just ideas, maybe it's something other

[feral dock]

you could mess with the shader for the creeper green overlay thing