One of my Christmas gifts this year was a kitty of my very own. My parents have two cats as well and when they were moving I "housed" them for a week so that they wouldn't get out or stepped on. While they were at my apartment I got them a dangle cat toy. Its just a plastic stick with a ball on the end of the stick and a sting dangling from it. They love killing it. Stella, my kitty, is NUTS about it, so I made one for her to have here at my apartment. (I take her with me whenever I go to my parent's place.)
PetsMart actually sells the plastic sticks, so I got a green one (my fav color).