A small fraction of closets should contain a skeleton.

Sometimes, if there is space and there is no intersection with another corridor, a closet will extend 2 more spaces back (for a total length of 3). The middle space will be a secret corridor (or sometimes plain stone), and the second space will be a regular corridor with a chest with random contents.

The magic portal to the Ice Queen’s Realm should always be placed in a closet. Optionally, the closet could contain a cloak and the level could contain other references to The Lion, The Witch and the Wardrobe.

Award some experience points when the hero discovers a trap door in a “Vlad was here” closet by searching for it (not by triggering it), because this demonstrates that they are learning that such closets contain trap doors.

Occasionally, instead of a werecreature corpse being placed in a closet behind iron bars, a live werecreature will be placed there instead.

Sealed closets (with either a wall or iron bars) generate some additional item loot on top of their guaranteed scroll of teleportation.

Put engravings outside or nearby inaccessible closets so that you know that something’s there.

A very small percentage of closets have a random item generated in them, even if they aren’t sealed off.

Random closets that have secret doors (but not no door at all) can sometimes generate a random item inside, or possibly a dungeon feature like a sink. (Generating a sink would be a bad idea unless the sink glyph is changed, since it’s otherwise identical to the corridor glyph normally used for closets).

Non-inaccessible closets have a small chance of containing a monster on level generation.