This website has endless instructions to do anything you could possibly think of. I like how it breaks it down so that you can search different categories.
I think this is a teaching tool that you could add to things that you already have. I liked that you can research by different categories instead of it all being thrown together.
How I Use It
I would let the students research whatever topic we were working on. This seems like it would be a good tool for a science fair project. You could find different instructions to create things.