You're welcome!
Bleenie, it's so nice of you to be doing this and donating to the shelter. Some little kitty is going to be so comforted by this.
I know some people make little crocheted cat toys, too. Little mice or balls, that they stuff. I usually sew cat toys out of scrap quilt fabric and add a bit of catnip to the stuffing. You can make toys out of old clothes fabric, too.
Do the people at the shelter have a cat room that the cats can be in or is it only cages? If they have a room where people play with the cats, you could try making a crocheted wand toy. Anything like a dowel could be the wand. A crocheted chain, heavy yarn or a cord could be attached to the wand and the toy at the end.