im thinking about minecraft's mountain biomes. specifically, variants of them i would add and change around
i think i'd make it so the existing stony peaks biome would be specifically the mountain peaks for areas that are hot and have low moisture values, and add a new one for hot and high moisture areas that would feature cloud forests (look them up, they're cool)
basically just overgrown peaks to match with the other non-mountain biomes in that sorta temperature and moisture range (jungles, mangrove swamps and the like)