Brensle's Unrelated Minecraft Mod is a mod that adds tons of new content from new items to new biomes and mobs, if you think it's simple... DON'T, the mod has many things that, on the surface, seem simple, but deep down they aren't. (btw Creative mode has a special item waiting for players to grab it lol)

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Note:Mod has traces of mobs with high HP but Decent drops, beware players

UPDATE: v2.1(WHY IS THIS V2.1 instead of like 1.5) made Customization easier to get as it is no longer limited to one dimension at low height(for 1.18) and is instead able to be found in the overworld at a low height... dumb I know