Hi. I found a great Youtube site called "Ferret Tails" and while I don't have any ferrets, I have found some of Sara's ideas to be great for kittens in shelters or rescues or your own pets. Here are two examples:
(157) How to Make a Cuddle Cup for Cats / DIY Tutorial - YouTube
(157) How to Make a Cozy Cave / Sewing Tutorial for Small Animals - YouTube
I have made several of both (pictures attached) and they were so easy to follow. She has several other ideas that I will be trying. The Cuddle Cup for Cats is perfect for my kitty, Sundae. These ideas are wonderful for any small pets and, when made larger, for other pets.
Just wanted to share.