VerseCraft is a mod that adds new blocks, new plants, and more. It's a great addition to the vanilla game.
https://www.curseforge.com/minecraft/mc-mods/versecraft
https://modrinth.com/mod/versecraft
The code to implement some of the ideas I wanted to implement was taken from WilderWild and TrailierTales by the FrozenBlock team.
https://github.com/FrozenBlock