If I recall correctly, Zangband had the "Stairway to Hell" monster which looked, naturally, like a down staircase. But this was back in the days before mimics were remotely successful at disguising themselves as objects.
That monster was slightly darker grey anyway. It was a mimic that intentionally didn't try hard. Just a trap for people who arent paying attention when they get demons summoned on them.
Actually, why are there no stair mimics in the game?
Play PWMAngband. I ported the "Stairway to Hell" and "Stairway to Heaven" from another variant and coded them as "feature mimics" to give them the same behavior as Angband object mimics (they "look" like stairs until you bump into them). This also allowed me to add Door mimics.
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