Not all cats like catnip - I think I heard something like one third of cats don't react to it at all.
I think it depends on what they're interested in. Most of my cats have liked a thing called a Kitty Teaser, but Blackie doesn't. Sparky likes crinkly foil balls and things with bells - I think part of the reason he likes plastic bags is the noise so those are kind of the same. Blackie likes those real fur mice. I never see him play with them, but I eventually find them in pieces around the house (the brown plastic base looks like a cat poop). Original Sparky, Blackie's brother who went to live with another family, liked soft toys the size of a roll of socks that he could really wrestle around with, preferably the fleecy ones. Patches, who also went to live with a friend when she bought a house, didn't play with anything but she liked to hunt and brought us presents quite often. She liked watching birds so we got her one of those platforms that attaches to the window sill. They're all different.