Change the bedrock to a biome-specific texture in the nether roof (Y=128). This is an upscaled version of Visible Nether Biomes by voxelity.
![Faithful 32x - Visible Nether Biomes [Addon]](/_next/image?url=%2Fapi%2Fproxy-image%3Furl%3Dhttps%253A%252F%252Fcdn.modrinth.com%252Fdata%252Fvtl9XOjm%252F8255dbbdb8b76768b120bd6cfa99f1ffada07e0b_96.webp&w=256&q=75)