According to World Champion Speaker Darren LaCroix, one way to open your speech if you are speaking at a conference is "I love [your theme]!" Substitute "your theme" with the theme of the conference and tie the theme into your speech. For example, if you are at a conference with a theme of "Think bigger" and you are giving a speech on motivation, you could say, "I love this idea of "Think bigger"! Thanks to "thinking bigger" I have been able to motivate myself to success and today you will learn how to use "thinking bigger" and several other techniques to motivate yourself to achieve miracles!"
Professional Speech Coach
Free speaking tips at: http://speakingquicktips.blogspot.com