One forgettable way to end (or finish, close, or conclude) a speech is just with “That’s all, folks”. It’s not hard to do better than that old Warner Brothers Looney Tunes cartoon ending though.
A brief article by Peter F. Jeff lists 12 ways to close your speech, which are:
Another article by Jim A. Peterson lists 22 ways. More detailed advice can be found in a Toastmasters text on Concluding Your Speech.