From a search engine's perspective, unique content doesn't necessarily mean a unique idea that you've written. You can simply take another article on the Internet, re-word it so that it's not duplicate content and voila, it's "unique".
This gotta be the best advice on how to create unique content. DUH thats why i always say, "Whenever a man tries to do the RIGHT thing, 10 people lure him to the wrong thing". He finally does what those 10 people tell him to do. lol