Found both of these a month and ~400 miles apart. Holds or leashes for something?

Got a Eweadn mechanical keyboard and I really like it. After months of use, however, this greenish teal/turquoise stuff accummulates on the keys I use the most. It also accumulates on the sides of the keys, and it doesn't clean off easily. It seems to originate between the circular cap and the rose-gold plated rims. What is?

I apologize if this isnt the correct community to post this in, i couldnt find a generic 'what is it' community.

Got a Eweadn mechanical keyboard and I really like it. After months of use, however, this greenish teal/turquoise stuff accummulates on the keys I use the most. It also accumulates on the sides of the keys, and it doesn't clean off easily. It seems to originate between the circular cap and the rose-gold plated rims. What is?

I apologize if this isnt the correct community to post this in, i couldnt find a generic 'what is it' community.

Edit: in Belgium if it gives any clue

It's a Rii Mini Keyboard i4, and my concern is that it's a microphone. I just noticed the hole and think I'm probably wrong in what it is considering how big a deal it would be if it was a mic that isn't advertised.

What could this hole be for or what is it? Thanks in advance, hope this doesn't violate any rules.

Location: Sydney, Australia

Does not react to a magnet. Does not show any signs of rust. Bent slightly.

Looks almost like a mechanism from inside a click pen, but those normally don't have a stepped stabby end, nor need to be made out of metal.

SOLVED: Stud earring. Gem goes on the the star end, second retaining piece goes on the stabby end. Thankyou.

Quoted from my mother:

"A month or two ago, I purchased these napkins at Dollar General. When I opened them up to use them, I noticed that they just had weird shapes on them. Through the packaging they looked like they had flowers or something like that on them. So fast forward to a couple days ago, I bought another pack of these napkins, again from Dollar General. Just today I started to pay attention to the images on them...... what the HELL are they? Grubs? Turds??? What's your take on these weird napkins? Love you, Mom xoxo"

My wife thinks they're meant to be mitochondria and bacterium that failed or ran out of ink while printing and inevitably wound up at Dollar General.

I think they're either turds or croissants. Maybe both!

Thanks!

My roommate found a bunch of these at a thrift store near Toronto Canada. No tags so potentially home made the arms are noodly and you can chain them together. No idea what this guy is but we love it and wish we got more.

It's made from wood with what seems to be real teeth. Can post more pictures if needed.

[Solvex: EcoBee Smart Sensor]

About 4cm, powered by CR2477 batteries.

Edit. Found another one, and this one had the top off.

This container currently holds sewing pins. The text that wraps around: P2HEWARQI60P3HL51EHCBDRA01PKFGNBYCXDWA5SJ4

the text has no clear beginning or ending.

Here is the bottom:

The container is 5.5cm in diameter.

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Cleaning out a library and found these with pieces from several dozen board games. I'm not 100% sure they even go to a game.

The symbols don't look like alchemical or occult symbols I'm familiar with.

This little guy was crawling across a pedestrian bridge. The front had what looked like a shield-shaped cover over it in the same color as the body, and it has a light blue spike on its rear.

Does anyone know what this is and what it turns into, if anything?
The thickest part of the body was about 1 cm in diameter.
Found in a park in Brussels