Here's last year's assignment that dealt with self-control:
http://www.talentsearch.heroesgifted.com/writing-assignment.htmlIt was an article from the New Yorker. I just cut and pasted it into Word and it came out to 9 pages single spaced. A speech would work, a essay, a magazine or newspaper article, maybe a chapter of a book.
One of the best general topic ideas I've received so far is following your own path or marching to your own drummer. But I don't have an article for it yet. It needs to be universal -- something that any middle school or high school student can write about.