14 years ago I got this tattoo, now I want to turn it into a sleeve

I’ve been struggling to figure out a good transition from this PR Flag and frog to something more like a stylish design or even anime-ish. People have said to stick with a jungle theme but it’s hard to visualize something. Any ideas are good ideas! Thank you!

First

I had a long standing plan for what my first was going to be whenever I got the courage to finally get a tattoo. Then one day a friend showed me a picture and said “we should get these”. Now this is my first tattoo because there was no way I could say no to this. I know it’s not “amazing” but I love it and have no regrets

What is this thing bolted near the door of our garbage disposal area in Germany? It's bit bigger than my fist. It not a lock.

This clump of dust and hair just appeared in my paper bin. Never had these in my flat. Single with no pets. Any ideas where it comes from & how it got there?

Found this metallic(?) disc submerged in a little stream in the italian alps. It's about 10cm in diameter and 2cm thick. I didn't take it out, in case it's some kind of explosive (which I doubt).

What is this remote control type of thing? Keychain sized, needs 2 AAA batteries. May possibly emit noise?

Some kind of metal cap on the ground outside a prewar NYC apartment building

What is this thing? 5" rusty metal tool with grip and a wrench, found in western North Carolina

Eastman Kodak Co. solid aluminum (?) block with dial and measurements

The two threaded holes are the only thing other than the dial on the cube. I image this is part of a camera setup, maybe mounted on a tripod to get precise image adjustment for the camera? The dial has very small threads and takes quite a white to spin. There are other measurements on the shaft that the dial is mounted on, I think 1-10?

What is this tank next to our hot water heater?

It is very loud, is it safe to put a towel over it to reduce the rattling noise?

What is this horizontal piston-like thing connecting the body of two passenger train carriages with each other / with the bogey?