The last time Destiny cleaned his cage, rather than buying new litter, I ran an entire High Plains Reader, a weekly alt-scene newspaper here, through the crosscut shredder. It worked just as well, it's decidedly less dusty, it is friendlier to the vacuum cleaner, plus it has the added benefit of being 100% post-consumer recycled newsprint.
Gerbil Gerbil (as I call him) is awfully fun to watch, especially when he's trying to get at a paper-towel tube just out of reach.
Recently I was gazing on his tiny adventures when the phrase "Okay, we've got enough" jumped out at me. Spread out within the gerbils litter, I also found many more shredded words and phrases: "social and com," "classified di," "qual opportunity emp," "rock turn," "with a mission." Our gerbil is becoming a fragmentally literate gerbil; I hope he is using his education for the good of gerbilkind, and never never evil.