By default, geysers have one color (like in nature). With this mod you can change the color of geyser by placing a supported block underneath the magma block/lava.

There is couple of blocks set as default and you can change them later:

Netherrack ➔ Red
Soul Sand ➔ Cyan/Teal
Soul Soil ➔ Dark Blue
Moss Block ➔ Green
Glowstone ➔ Yellow
End Stone ➔ Pale Yellow
Blackstone ➔ Dark Gray
Prismarine ➔ Cyan/Teal
Amethyst Block ➔ Purple
Packed Mud ➔ Brown
Cherry Leaves ➔ Pink
Basalt ➔ Dim Gray
Obsidian ➔ Black
Blue Ice ➔ Light Blue

Features

Block-Based Colors: Geysers automatically adopt the map color of the block underneath them.
Custom Block Colors: Link any specific block to any color of your choice.
Global Color Override: Set a single global color that overrides everything, turning all geysers in your world into that color.
Hex Code Support: Choose from a predefined list of colors (e.g. blue, red, purple) or use an exact HEX code (e.g. #FF0000, #00FFFF).

Commands

/geysercolor set <part> <color>
/geysercolor reset
/geyserblock add <block_id> <part> <color>
/geyserblock remove <block_id>

Note: All your command changes are automatically saved to config/colored_geysers.json in your .minecraft folder.

Colorful Geysers