I bought my cat a stuffed mouse on a string with a bell on it. She tore the stuffed mouse off the string and now enjoys the bell on the end of the string especially if I hold it up and let it fly around her head. She dives for it and swats its back - usually into my eye!
She prefers the cords hanging off the blinds on the windows and loves any pens lying around on my desk. They end up under the couch never to be seen until I do another clean up. She likes fluffly looking mice too. I don't know why.