I once dragged one of those ceramic powerline insulators across two international borders because I found it lying around and liked how it looked. It took up the majority of the space in my backpack, so I had to buy a second backpack and carry it on the front of my chest lol. Apparently the reason they have that odd shape is so that when it's raining, water can't make a continuous trickle between the wire and the pylon
I think collecting those was a bit of a thing in the 60s and 70s, I've run across multiple older folks who did. Pretty sure it eventually crossed with the "turn random shit into lamps" fad in the 70s because that seems to have become a fairly popular thing to do with them.
The dad of a friend of mine does collect those, and ceramic ones. As an employee of the city, he got permission to open a local museum of insulators in a bulding owned by the city.