I have a "This is Fine" dog Funko Pop on my desk at work. He works well for rubber ducky programming, and he encapsulates the feelings I typically have after dealing with some of my clients.
How exactly does a newton's cradle help with focus? I never had one, and I think I'd end up focusing on the motion of it instead of anything else I'm supposed to be doing.
Rubik's cube. I learned to solve it years back and got interested in speed solving. I just pick it up and solve it a few times throughout the day. It's also fun to fidget with.
The most satisfying thing when I need to fidget is something to take things apart and put back together. And the best things for that are ones that can be stripped and reassembled without me needing to look at them.
So far the best of best is this "multitool pen" I got for secret santa last year. It's nearly worthless for any of its advertised functions, but as a fidget toy I really like it.
If you don't know what a spring duck is, that's because I created it out of random shit that we found around the office. Specifically, a plastic duck, and a spring.
The Dynavap m7xl Rosium. I don't think you even have to know what a dynavap is or what its used for to appreciate its aesthetic appeal.
Its the most beautiful metal stick ive ever had the pleasure of holding. The way it changes color as it reflects light is so cool. You can just spin it around and fidget with the cap while watching the colors. I am considering get in a spinning base to put it on so I can watch it rotate automatically