So...for the kitties...

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We run a small independent cat/kitten shelter, and always need new toys for them. like socks in a washer or dryer, they simply disappear. Also, when someone adopts a kitty, we send along their favourite toys to their new home with them.
Anyone have tutorials or sites where we can find small, simple toys? I know about the catnip-filled baby socks, and the catnip-stuffed crocheted tubes. I was kind of hoping for knitted/crocheted mice, etc. Or those felted balls/mice.
Ideas?
Donations?