FOSS gamedev and creative worlds

hey all, lets collect ideas to realize in lua mapgens! everything goes if its doable and don't worry if your idea is suitable for official or not. just keep it tasteful and bring on your ideas. here are some quick ones of mine:

• cheese biome, yellowish landscape with round holes of various size
• moon biome with craters
• deserts with dunes
• bubble biome consisting of many spheres of various size
• qbert mountains

Maybe some kind of mud desert. No trees, cacti or anything. Mostly flat, with slight rises. The texture would look like dried cracked mud.

overworld biomes:

• savannah (intermediate biome between plains and desert).
• stone deserts. absolutely nothing grows in them
• tundra (intermediate biome between plains and snow): low vegetation, occasional snow,
• mediterran (only next to oceans): palms, palms, palms, olive trees, etc
• alpine. I mean, like, really high, way over cloud level and also steep at certain areas, so that it’s actually a challenge to climb the top. May consist of large stone-only areas. At a certain height, trees stop spawning here.
• volcanic (next to mountains/alpine): low vegetation, lots of stone and other hard materials and also ash. Home of lots of sulphur (if just any mod would implement it …) No grass. May rarely contain small lava seas at surface level.

underground biomes:

• ground water - large storages of water that aren’t connected with any other cave
• water rivers - essentially the same as normal caves, but with water inside. May be generated after the ordinary caves to connect them with each other. Most likely they should take close-to-horizontal paths.
• lava rivers - long, highly uneven caves that connect underground lava seas. Should also take vertical paths.