Foam Roller Substitute

So I'm in a pinch right now and I don't have a foam roller nearby. And since I'm a broke college student, I may not be able to get one for awhile. But my calves are ridiculously tight right now from all the running I've done lately, and I really need some sort of foam roller substitute. Any ideas? Preferably something that a college student would have in a dorm room, since that's where I'm currently at...

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