Need ideas for a project

I want to build something on our Science Fair day at our school. Any ideas (maybe something electronics related)?

Make a variable filter and op-amp so that people can hear what their voice sounds like when you strip certain frequencies out :)

Or try something with speech-recognition or text-to-speeck. People always like that kind of (still) futuristic things.

Thanks for the ideas....come them coming.:)
I was thinking of building a helicopter flown using remote control but I can't find any information on it online.:(

I built a helicopter out of lego. :D :rolleyes:

Build a small robot.

There is a cool prog on BBC called Science Shack. They do all these inventions. Here's a link to the site:
http://www.bbc.co.uk/science/scienceshack/
You might find some ideas there.