Fog's latest toys are caps from soda - the kind that screw off and on. If you have an old gift card - the kind that's about credit card thickness - cut a circle to fit tightly inside the cap. Put a couple of pennies in the cap and push the circle in so the pennies rattle and roll them along the floor. It's best to cut the circle large and then cut away a sliver along an edge until the circle fits and stays. We've had no problem with these coming apart once we have a good fit. We have a few of these and Fog can entertain himself since they often roll away.

We also built him a cat condo and he's up and down that quite often. He also likes sleeping on it when it's naptime.