There's nothing wrong with traditional weddings. The fact is, they're as much a theme as anything else. No matter how conservative or outlandish you want your wedding to be, a theme allows you to both express yourself and streamline every element of your wedding, and thus, your decision-making process. Suppose you can't decide between roses and tulips for your bouquet. Your theme makes the decision for you. If you've chosen a springtime garden party theme, tulips would be the natural choice; but, if you're having a classic New York Wedding, it's roses and Sinatara, baby!
And remember: As long as you're marrying the person you love, it'll probably be the best day of your life, no matter what color the flowers are, what you're wearing, or where it all takes place.