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They only use I've ever found for them is to hold more CD's. If I don't have a case specifically for a certain CD, it goes in there. I used to do custom CD burning and a few people screwed me on payment so I have a lot of those.
You can't put cereal in them because of the little post in the middle. I mean it's annoying as hell.
You can't drink out of them, again, because of the post. It bumps your nose.
You can break the post off, but now you've compromised the integrity of the container and made it worthless for all intents and purposes. Who wants a hole? That's not a question.
You can smoke a good one, pour a little gas on it and light it up... The pyro-technics alone is worth the show...
I mean other than that. what CAN you really do with them?