barrel pack
create a resourse pack where absolutely every block and mod texture are barrels with plants included
barrel pack turns every baked model into a single cube that uses a barrel-with-plants texture. The client-side initializer registers a model loading plugin that overrides every model request (vanilla and modded) with a generated cube referencing barrelpack:block/barrel_with_plants. A tiny 16x16 texture is bundled to keep the atlas lightweight and to give the barrel foliage look.
Usage: drop the built mod jar into your Fabric 1.21.1 client’s mods folder and launch. All blocks and items now render as the same barrel-with-plants cube regardless of their original assets.
Notes: interfaces that bypass the baked-model pipeline (certain block entity renderers, GUIs, skyboxes, etc.) keep their own visuals because they do not use standard block/item models. If you want those overridden too, the pack would need deeper rendering hooks or a resource-pack-level texture interceptor.