The Toy Box
A child's toybox that will be able to be opened once a week to pull out a random toy.
Toys can be either helpful, hurtful or very dangerous. Like a toy sword thats sharp as plasteel, a wrestler's belt that increases your fist attack damage and speed, or a killer Jack In The Box that tries to eat you.

if this goes the S.C.P. direction and you want to capture and study the various items it would be interesting to have expansion mods that add some of the other groups, (Chaos Insurgency, Wanderer's Library, etc) but parodied obviously. As well as maybe a pair of ideo memes that make how you handle them change. (i know this happens much latter but just giving some future ideas for the mod)

Body swapping carpet from Gravity Falls.
Each pawn gets the other's learned skill levels and chronological ages. They also get the other's traits, except those that are physical or enforced by genetics.
(physical traits would include things like tough, super-immune and beautiful)
Unsure if names being swapped would make it more or less confusing.
Is triggered if two pawns walk on it at the same time, with a cooldown to prevent instant swapping back and forth.

Adds these two relationships:
- Body holder: This person is in your original body.
- Body owner: You are in this person's original body.

And adds 2 versions of each relationship:
- Swapped. A pawn has the "swapped [insert]" relation with whatever pawn their [insert]'s conscience is inhabiting.
This moves between pawns with the conscience.
- Inhabitor. A pawn has the "[insert] inhabitor" relation with whatever pawn has the original body of their [insert].
This always stays with the original body.
and assuming you don't want any Alabama Occurrences, no romance or lovin' between pawns if either of them is inhabiting the body of a relative, or a relative in someone else's body.

Swapped and inhabitor merge into the normal version of a relationship if present in the same pawn. Jerry's sister swaps bodies with someone, then swaps back again. His "swapped sister" and "sister inhabitor" relations with her merge into "sister."
Jerry's sisters Samantha and Alice swap bodies. They're both still just his sisters, because each still has the body and soul of one of his sisters, just swapped. The fact that they're swapped is marked by them being each other's body holders + body owner's.

Not sure if it's possible but how about an weird old impossible to work radio that colonist can use for enjoyment ranging from small as it plays normal music to major as someone on it compliments to them but it has a random chance to "slight" them for just as much

"+5. I enjoy the music playing, it's quiet relaxing
"+20. (Or what ever mood buff you see fit) the person on the radio told some deep and very personal compliments about me"
"-20. The person on the radio called me out for my horrible flaws, it might be right and I can't stop thinking about it"

I'm not sure if this too tame or out there so I'm fine with possible feed back

Killer's Gambit

An artifact that has a chance to "reward" the holder. Perhaps it heals their wounds, coagulates their bleeding, or even grants them a damage buff. Or it may just kill them outright, give them cancer, or do literally nothing at all.

I think it's interesting, has it's risk/reward, and I'm not even entirely sure if it's possible to add.

Could be hat, a necklace, an actual weapon or other.

Phantasm Plague. A type of sickness, caught randomly similarly to malaria and etc, that makes a pawn periodically manifest monster creatures when asleep. These never attack and are really easy to kill but their spawn is periodic so you have to have someone stand vigil by sick pawns throughout night, or put them in a trapped maze, or make them not need sleep as long as they're sick. Types of phantasm:
* Gremlin. Approach random machines and make them breakdown, alternatively just having them around for too long causes a random breakdown event, periodically.
* Psychopomp. Same but instead of breakdown cause a harmless-ish character event like sad wander or corpse fixation.
* ok lol sorry only two ideas I had there

Note: this is a sickness/condition not an object, if you wanna have an object like that specifically you can probably do a medicine that puts a character in a comma they cannot wake up from, for a duration and makes them spawn these creatures, and upon duration end the pawn losses some strongly hated traits like pyromaniac, volatile, slothful. This can probably influence the spawn phantasm, like trying to deal with really disliked pyromania will spawn phantasms that set things on fire unless dispatched, and negative social traits just have sad wander or other relatively minor breakdowns happen. Waking up a character in the supernatural comma may also cause a toll onto them like give them another negative trait or scar their brain.

Hemovore Bombs. Prototype devices of unknown make and scientific principles behind them, makes organic creatures expel their blood violently. Function like grenades that make anything capable of bleeding in area of detonation develop multiple strong bleeding wounds, but insects or synthetics are immune. AoE is always higher than regular grenades, too, but area of effect is somewhat random and unpredictable. Small and rare but nontheless possible chance of bomb triggering on wearer randomly, or when picked up. Just a random event sort of deal, nothing too frequent.

In situations where X or more pawns or creatures are affected by a single Hemovore explosion, a Blood Singularity appears, a lasting anomalous phenomena that causes bleeding once a few moments to anything nearby. Cannot be destroyed, only waited out, but can take days to vanish. It will also wander a little bit, shifting it's area of effect so even if it spawned in your killbox where it helped you finish off the elite bandit raid, there's always a chance it will float into your barn or hospital room next if you don't pay attention to it's movement.

Entropy Siphon, a device that requires someone to get strapped to it, after which they will begin to grow old much much faster, but also every other pawn naturally regenerates and recovers from diseases faster, all plants grow faster, and in general beneficial natural processes are hastened. This one is honestly pretty useful since you can just drop captive enemies into it but also cruel so I guess it thematically works? Can't have just harmful things in a mod, will make it a challenge, gotta throw horrific but beneficial things also. Alternatively can add a mood debuff if someone dies while strapped to it, since they die horribly, so you have to micromanage them to prevent their death, for extra horror you release them back into the world as a frail and weakened elder this way.

Add a Sorta Scarlet King boss that could happen if your colonist aren't scared of the Scarlet King, He will come with a marker that says [REDACTED] or He is coming... He will spawn flesh-mass and void all over the place as he descends, if you kill him [By using another anomalous object such as a anomaly version of 999] He will drop super OP scarlet chains that bind anomalies in a different reality, giving bioferrite and dark research without a way to break out... infinitely.