BulletLukey has made an awesome world for this. You can join our realm (as long as it still runs) or download the world yourself.
In this world, go to the update 1.8.0 area, and spawn one or a few cats. Tame them, then change the day to night and go to sleep. Upon waking up, check around you to see if there are any things on the floor which the cats might have given. Due to everyone needing to be asleep, it is better to do this in a world by yourself instead of in the realm.