Step one: Recreate your thesis.
The first sentence or two of your conclusion will examine what you have written in your previous body paragraphs, and ultimately reword your original thesis idea. You might consider copying and pasting your thesis so that you can visually see it as you work on the first sentence of your conclusion, but don't keep the copy and pasted version and call 'er good. It is okay to be slightly more relaxed here and fit your ideas into two sentences rather than one. In fact, I find it helpful, and most pleasing to include an overall conclusive thought you have come up with (as a combined results of your pages and pages of "thoughts" in your essay) before actually rewording your thesis.
Step two: Summarize your major points
Essentially, look over the topic sentences of your bodies and reword them cleanly here! Use transition words to make things smooth.
step three: Create an application
Without using personal pronouns (use "people" instead of "you" or "we"), create a 1-sentence application, something readers can learn as a result of the ideas presented within this essay.
step four: Good night kiss
This is where you get a little cheesy. Although cliches are generally a no-no, and some teachers do not allow them at all, I am okay with a cliche used to wrap up your overall ideas. You could also consider using literary devices (similes, metaphors, alliteration, rhyming, etc.) to let your last sentence be catchy. This is kind of a "this shows" sentence without saying "this shows" and just ties up any last loose ends you haven't already come up with. It might also be one additional thought to the application above, but written in a catchy, conclusive manner.