Big Dark, this is a fairly popular question. If you get the chance run a query in the search forum and you will find many of the gang here have listed options in great detail. some cheap, some if you really want to go nuts. On the lower price side of things you will find that hung carpets on walls, sleeping bags and the like do the trick. Padding corners and making them rounded and so on. But agian the search at the top of this page will really give you some great details.
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