Snickers loves his catnip sock; he'll carry it around in his mouth, trilling & crying, and also drags it up to bed with him when he's ready to sleep.
Hammie goes bonkers over those little furry mice with the long tails, bought in packs of 6 or 12, at PetSmart. He chews the tails & drowns them; then, after I 'save' the mice from the water bowl & throw them around, he makes sure to bat them into a closet so he can open the closet doors and feel like the big bad mouse killer when he goes in and gets 'em.
Birdies... I have these tiger-striped, catnip filled ball things with feathers sticking out the top. Jessie and Dusty in particular, the girlies will walk around with the birdies in their mouths and CRY as though they just brought home dinner! Dusty gets REALLY into it; she will walk around with that thing in her mouth and just howl like mad. Then she'll drop the birdie & walk off like nothing happened.
Any type of ball is fair game at my house. My daughter has several of those tiny bouncy-balls that ya get from Kroger's little vending machines out front. Hammie finds them and plays with them til he passes out!
Zorro likes the laser pointer. Zorro's kinda big & clumsy, very slow moving. But when you get that laser pointer out? He is on a hunt to the death to kill the 'red bug'. He'll sit and stare at the wall where we turned the laser off, for hours it seems, waiting for the red bug to come back.
Any and all boxes are fair game, too.