Like how Doom 64 was darker, creepier, slower, and more atmospheric than the classic Doom games? Then use the D64ifier to D64ify your game. Make Doom, Doom II, Final Doom, No Rest for the Living, and most other vanilla mapsets look, sound, and feel like Doom 64.
A alternative version upscaled textures for The D64ifier used AI as a basis, and also optimized to work with low-end hardware's or laptops
It has become better, but it is desirable to process textures according to the same principle as here: Moddb.com
Nice screenshots
I can imagine something like this becoming even better if paired with something like RELIGHTING mod or DarkDoomZ mod.
My footage of Relighting mod:
Add morelights Forum.zdoom.org