Listen to Coot. The problem with entertaining 3 month olds is that you have a problem putting yourself in their place, and tend to overdo it. When my son was that age, we just put a broomhandle across his cage. From it, just within reach, we used multicoloured strings to hang everything from .50 caliber shell casings to old toys, even an old Rubic's Cube. He could put them all in motion by himself, and spent most of the day just lying on his back drooling, watching them move and make noises. A perfect kind of mild hypnosis.
