What should I do with a tub full of pennies?

I have a plastic tub full of pennies and am wondering what I can do with them. I have about 50 pounds worth and want to do something creative with them. I don't care about the monetary value so I don't care if they get destroyed in the process. I am aware of the laws involved in defacement of currency and this does not apply unless I intend to p it fraudulently which is not the case. Thanks