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I remember a thread like this a while ago that had some great ideas and topics in it.
For my speech classes in highschool and college, I would come up with the most rediculous topics. I remember doing a speeches on dryer sheet, sporks vs spoons, glue in a bottle vs a glue stick... It kept people interested in the topic and showed that I could take a odd thing be creative. So my advice is try to think of something odd and go with it. Like how are tube socks made, how t-shirts are made (you can get into the new fad of Tall Ts, screen printing, fiber, shirts of the past...), how are snorkels made, how are super balls made, how one would make a mini volcano at home (cheesy but you can make it funny)...
Good luck man