They are awful building materials. They’re so dark that you can’t see any detail, and the only contrasting blocks that fit the Nether are Red Nether Brick, which has the same texture as Nether brick.
Just look at this: https://imgur.com/f3sWFpB. You can't even make out the fences and stairs I used for the entrance until you get really up close, which even then it's still hard to look at: https://imgur.com/gk1KAGD.
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