I wandered into an abandoned blog and found Things I Just Don't Need as a series of posts the blogger was doing.

"An occasional series of things companies try to sell me that I just don't need."

What can you find to write about. Something kind of crazy, a waste of space time and other resources. Then, write about it, explain your point of view. For an extra writing challenge debate the other side too. Why is this something someone would want. It never hurts to understand both points of view.