If you're like me, you don't part with scraps of fabric... and they are over flowing their containers. A cat nip toy only takes tiny scraps of fabric...and I bet a cat won't even mind if the whole mouse isn't the same fabric.
The cat in the picture was adopted from a local animal shelter. She is a very well behaved cat and knows she isn't allowed up on tables, but once I put cat nip in the toys, there was no talking to Skittles about house rules.
A blanket for the cages at the shelters help the animals feel more comfortable. The shelter may even send the blanket home with the pet to offer it security as it settles into it's new home, if they have enough on hand for the new animals that will be coming in to the shelter. Consider make a couple or involving a local group in make a pile for your local animal shelters.