I have seen some watt meters, analogue and digital, turned into working decor pieces. I have seen them get turned into stopwatches, clocks etc, all battery powered. I guess these meters can be turned into any counting related device.

Yeah, all you have to do is attach a servo that is controlled by something like an Arduino to the input gear of the register and you can get the register to display any value you want with the correct amount of programming!
I am not one for modifying vintage equipment from it's original state though.

 Here's a photo of mine : https://www.lighting-gallery.net/gallery/displayimage.php?album=lastup&cat=12766&pos=0&pid=235431

Nice meter, I don't really collect them but I do have this modern Invensys VCON-II watt-hour meter in my stuff.

I don't plane to have a full collection of them but I do want to track down an older meter with the spinning disk. Preferably a Westinghouse Canada one as that's what my house had before they switch to smart meters.

I have one of them Westies
a storm knocked a tree over and as the tree fell it landed on the power lines ripping the mast and the south wall off my house the emergency electricians came and removed the meter and put it SOMEWHERE SAFE
the insurance paid maintenance people AND HYDRO could NOT find the OLD meter after a day looking for it installed a NEW one
I found the old meter 2 months later in the LIVE WELL on my fishing boat that was in my yard when the incident happened and the emergency electrician I guess found the ONLY place safe
now it sits on a shelf in my house
I have thought about making a desk lamp OR something out of it but have not done anything with it