Minecraft wiki entry for Buffet, associated text: A desert biome that was set to generate as floating islands, resulting in multiple "End-like" islands that are instead composed of blocks usually found in desert biomes.
A beach biome generated using Single Biome world type, showing a borderless beach that looks like a desert, but with naturally spawning turtles.
A river biome generated using Single Biome world type, showing a borderless river that looks like a shallow ocean.
A Void biome generated using Single Biome world type, resulting in terrain made entirely of stone with a single block of cobblestone generated on the player's spawn point.
The End generated using the Single Biome generation.
A nether biome buffet world generated using End terrain.
The End biome buffet world generated using Overworld terrain.
A warm ocean biome buffet world generated using End terrain.
A sparse jungle biome buffet world generated using End terrain.