Kotatsu's Basic Blocks
by KotatsuKun
Kotatsu's Basic Blocks adds 834 coloured blocks for building and decorating in Creative mode, and its colour labels show each block's hex code.
What it does
Most of the content is a large set of coloured blocks meant for building. Each block has a hex colour label or description, and the mod adds many texture variations on top of the base colours. A new coloured lights system, carried over from Helium 2a, lets builders use tinted light sources in their designs.
Blocks are not yet craftable in Survival mode; the author describes Survival recipes as a future update. The mod was revived by its author after an earlier decoration mod that added many coloured blocks had stopped being maintained. It requires Fabric and runs on client and server, so both the server and every player need it. Files are published for Fabric only, for 1.21.10, under the Apache License 2.0; the code is not open source.
Key features
834 coloured blocks
The mod adds 834 coloured blocks intended for building and decorating, with a focus on Creative mode.
Hex code labels
Each coloured block carries a label or description showing its hex colour, which helps when matching a palette.
Coloured lights
A colour lights system from Helium 2a lets light sources take on the same tints as the blocks.
Texture variations
Many blocks come in extra texture variations, so one colour can be used in several looks.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Colour-coded builds
Builders can lay out signs, floors and walls in exact hex colours rather than approximating them with vanilla blocks.
Who it’s for: Builders and decorators working in Creative mode, especially those who want a wide, precisely coloured block palette. Survival players will find no crafting recipes yet.
How it compares
Color Blocks is a Fabric mod for 1.20 – 1.21.1 that is also client and server, under the MIT License, and it is not open source. Label My Items is a Fabric mod for 1.21.1 – 1.21.11 under the MIT License, and it is open source. Kotatsu's Basic Blocks targets only 1.21.10, so it is the narrower choice for that version.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Kotatsu's Basic Blocks | Fabric | 1.21.10 | Client and server | 2026-10-03 |
| Color Blocks | Fabric | 1.20 – 1.21.1 | Client and server | 2025-11-02 |
| Label My Items | Fabric | 1.21.1 – 1.21.11 | Client and server | 2026-08-05 |
Questions
Does Kotatsu's Basic Blocks require Fabric API?
Do servers need Kotatsu's Basic Blocks too?
Can the blocks be crafted in Survival mode?
Which Minecraft versions does the mod support?
In the catalog
Kotatsu's Basic Blocks is one of 12,078 Decoration mods on ModsFinder, and one of 6,982 Decoration mods for Fabric. 15,569 mods support Minecraft 1.21.10.
More from KotatsuKun
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What the author says
This mod currently adds 834 new coloured blocks, designed for building and decorating in Creative mode. These blocks aren't yet craftable in Survival, but that's coming in a future update! I remembered a certain decoration mod from years back that was hugely popular for adding tons of colored blocks, and I hadn't…
Official listing
- Modrinth page
- modrinth.com/mod/kotatsus-basic-blocks
- Owner
- KotatsuKun
- Published
- 2026-08-30
- Updated on Modrinth
- 2026-10-03
- Facts verified
- 2026-10-15