uses??? if any...

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My dad owns a sign company and the material that he uses comes on these cardboard tubes that are like 15" high and have walls about 1/2" thick. He has at least 50 and just throws them away because he has no use for them and they company doesnt accept them back. SO i was thinking of something i could do with them but there hasnt been any ideas at all so i was wondering if yous could think of some uses....thanks in advance!!