ZeroShader

About the shader pack:

The “Zero Shader” turns everything except players, particles, arrows, and Ender Pearls gray.

More details:
Bright elements on the player model have been replaced with a poisonous pink color (this also affects items and player armor).

Arrows are now white, and spectral arrows are a bright, poisonous pink.

The sky is completely white, both day and night.

Particles are also now a poisonous pink, which is very unusual for PvP.

FPS drops are minimal on medium settings.

This is a great option for those who enjoy dark themes and want to try something completely new.
Need: Optifine or Iris Shaders