Your conclusion will be directly linked to your thesis. So, the conclusion will totally depend on your thesis. In short, a bad thesis will produce a bad conclusion.
So, what you want to do is to make sure that your thesis has been proved by the time of your conclusion. If you have done this, wrap up things for the reader and make sure that you do not put in anything new. You want to end on a note of finality, not on a note of creativity.
Let me give an example. If you thesis is Antony is the mirror image of Caesar, then the conclusion should say something like: "In the light of the evidence, one can say without hesitation that Antony serves as a mirror image of Casear."
In your conlusion, you need to restate the topic of your essay and the main points you discussed in your essay. You then need to tie it all together and leave the reader with something to think about.