One of my cats always plays with my wife’s hair ties and then eventually puts them in their water bowl.

A different cat absolutely loves twist ties, probably because when he hits them on the floor they slide a little unpredictably.

And my other cat went nuts for foam earplugs. I used to work in a factory where you were required to wear them all the time so I would occasionally end up with some at home. His eyes would go huge and he would dig into whatever had them and get them out. He plays fetch, or rather used to since he doesn’t much anymore, but his favorite fetch “toy” were the earplugs.

Initially I didn’t want him to get a hold of them because I was worried he would swallow them but he just loved playing with them