The best speeches are those about odd things, I think it was tenth grade and I did a speech about dyer sheets. I would think of something odd in your life, like a spoon and give a speech about it. It sounds crazy, but it shows you can give a speech about anything.
Here is an example:
Today I am going to talk about something that you all know and use pretty much everyday. It is not a car, or Phone nor your beloved Ipod. But a spoon. Everyone understatmetns the spoon. The world of sliver is like the jungle, you have the king of the jungle the Lion aka the Knife then you have the next down fork, then finally the spoon. There are so many kinds of spoons out there, you have the tea spoon, sugar spoon, soup spoon and don't forget the grapefruit spoon with the knife like edges. Oh yes and I almost forgot about your mom's or dad's favorite spoon the measuring spoon. Spoons can come in all sorts of materials, such a metal wood and like in the cafe plastic.
The spoon has been adopted into one of the most handy plastic/silver-wear. This is called the Spork. This is like if you cross a tiger and jaguar. The spork could elimate the fork and spoon all toghether at the dinner table.....
Well hopefully this helps, sorry about the grammar and spelling errors I am too lazy to reread, plus i got to get out of my cube and go home for the night. Good luck on your speech bro...