Pocket Mice- My cats would love these, especially stuffed with some catnip! Free pattern.
3 Mice Catnip Toys: Your cool cat will go crazy! $9.95
Ethical Pet Felt Mice with Catnip Cat Toy (6 Pack) (Set of 3) $12.63
Plaid Mice with matching cords! I think maybe it's a concept design, but it's certainly an idea for a DIY.