Apeiron

Apeiron — Paint Your World
Ever wanted to build in exactly the right shade of teal? Or a soft warm beige that no vanilla block comes close to? Apeiron lets you place blocks in any RGB color you can imagine — all 16 million of them.
Using the Color Wand, you can open a full color picker with an HSB wheel, RGB sliders, hex input, and a color history — then place your color onto any Apeiron block. The color is stored directly in the block, so it persists through world saves, chunk reloads, and multiplayer.
24 block types, each with multiple textures:

Each block type comes in multiple pattern variants, giving you over 2.4 billion possible block combinations. That’s not an exaggeration. That’s 16 million colors × 24 types × multiple textures, and every single one is placeable in survival.
Whether you’re building a cozy cottage, a modern megastructure, or anything in between — Apeiron gives you the palette to do it right.
Supported versions: 1.21.1, 1.21.3, 1.21.4, 1.21.5, 1.21.8, 1.21.10, 1.21.11
Mod loader: Fabric