ONEPIXEL

A modpack that improves vanilla Minecraft. New graphics without shaders, effects, particles, or sounds. New mobs, animals, dungeons, and biomes. New armor, improved End and Nether dimensions. Increased difficulty and many other improvements. There are a couple of scary mods for variety. Caves have also become more dangerous, with mobs that become more powerful with each block deeper into the cave.

You can check out the changes in the modpack on my GitHub.