According to Pantone, the color of the year for 2011 is Honeysuckle Pink. It's 'Courageous. Confident. Vital.' and all in all I think it's a perfect color for weddings in any season!
The red in the bouquet makes for a great accent color!
You can add in light pinks with the Honeysuckle as accents.
For any season, pair it with Green:
Use a more muted green for Fall/Winter or a brighter, lighter green for Summer/Spring.