I've had a very busy summer caring for foster kittens. Two succumbed to the upper respiratory epidemic that swept through the shelter. But the rest were put up for adoption. I fell in love with a Tonkinese (a cross between a Siamese and a Burmese) that took about 2 months to adopt due to the epidemic. Instead of returning her with her kennel mates, I waited for a spay date and kept her with me. Had I returned her with the others, she wouldn't be alive today. She is really a 'rescue'.
I also wound up trying to domesticate3 ferals that I helped trap. Two did very well and were eventually put up for adoption. But the third had been traumatized before I trapped her. After almost two months, she remains skittish and doesn't like to be picked up. She would surely freak out caged up at the shelter and there is no way she would get adopted. But she has bonded with my new kitten, Emmy, and follows her everywhere. She has made it clear to me that this is her home.