Phoebe loves plastic bottle caps. Likes to carry it around all day, and into her bath. It one of my favorite things to watch her play with her bottle cap in water. She wants to stick it safely on the bottom of her bath to keep safe, she sticks her head under water and places it carefully. Of course it floats up to her frustration! So then she try to hold it down with a foot. Nobody wants her cap. But if she leaves it laying around Pikachu will toss it off tge cage, as he likes to keep things tidy.
Salty loves his long tubular bell, its a rare day he does not play with, attack, or bash his head on it. He has wood toys he likes, but I learned the hard way not to stock up on those, because he frequently changes his mind, and I get stuck with toys he ignores.
Today it's a radio antenna. With Meisha on my son's hand, he positioned her near the top of the radio antenna on my Ram pickup. She grabbed the top, pulled it back, and let go. With it doing a vibrating wobble, Meisha inflated. When it stopped. She did it again.
My Wally loves burls. just burls taken off of pine trees in my woods. I bake them in my oven for a bit to sanitize them, then let him go to town on them once they're cool. he loves them so much that they typically last 4 days at the max before they have no bark whatsoever left and are no longer interesting to him
The three brass ring swings. Each ring is about 6" in diameter, hung from the top of the cage descends about 24" including the bell at the bottom. He loves swinging in either the top or middle one upright, but for some reason likes to swing upside down from the bottom one while making a racket with the bell. The sets I have now are 31 years old, and show no signs of wearing out, though I've had to replace the bell at the bottom with a 2" cowbell because he bent the little ring mount that the original bell came with. I used a quick link now, which I tighten the lock nut with vice grips. He can't undo that....... yet!