I have taken Sudie's suggestion and blogged about caterpillars. It took longer than two minutes, but I don't think that matters.
Need an idea? Here are a few:
- write an open letter to a public figure
- list your pet peeves
- publish your luxury wish list. with links. I've done this before.
- write a list of questions that stump you
- tell how to do something--like "how to grow tomatoes" or something
- tell a true story, but write it as if it is fiction. with dialogue. etc.