I need to make something easy, fast, and cheap for a woodworking and metals class. Any ideas?

In my shop class, we are doing a mass production unit, and we are making something out of wood (or metal-preferably wood though) so that we can sell it. It has to be something easy, fast, cheap, and something people would buy. Our main consumers are high schoolers, teachers, and parents. We gave our teacher the following ideas, and he said no to them (either because they've been done in the past or because people could buy better ones from the store):

Birdhouse/bird feeder

Jewelry box

Picture frame

A box thing to go under the window outside for flowers

And some other things that I can't think of at the moment. Any suggestions? Anything would be helpful! Thanks!