I’ve made a mouse and an octopus for mine so far and they love them both! I was able to put catnip and silvervine in them. The silvervine is for Little Bitty who doesn’t react to catnip. If you’re still looking, I’ll link the 2 patterns I’ve used and some others I plan to make at some point. I think any small plush with catnip/silvervine would work, tho, tbh