I used to put a small cat bed for Kirby in his crate with a small bowl of water. he kept spilling the water almost every other day so i stopped putting that in there. then he decided to dig at his bed till it was in pieces. so now he has nothing in there except for a couple of really soft blanket and i always keep a few dog treats in there with him.

i wouldnt put toys in there though. might choke or swallow something they shouldnt and youd have no way of knowing till its too late.