You don't always need a color combo to make a beautiful wedding. If you have one favorite color, go for it. But there's color, and then there's overkill. In order to keep your wedding from being a spectacle of one color, pick a base color, and then accent it with shades of that color. This works particularly well with blues and greens. You can take a basic blue, and then play with sky blue, royal blue and even navy to create interesting accents.
Check out paint Web sites to see how shades of color work together -- just think of your wedding as one big palette.