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I actually really dislike this ocean theme i made, and the Mushroom theme is just the base and glowing mushrooms could be added (but I'm too lazy)
I'm really bored and editing a theme is definitely easier than creating one from scratch so here you go:
Hey, so I saw this yesterday and a Snow Biome theme took me 4 hours to make (and being kinda bored), but yeah I created a Snow theme. It may not be perfect, but It's always something.