The color combo of navy and light blue compliment the nautical theme of the save the date as illustrated by the light house, captain's wheel and compass.
Printing the save the date on a neutral canvas is such a smart and clever idea and I am especially loving the navy and white striped ribbon that wraps everything up perfectly.
You can see this invitation here at the Ice Cream Social Shoppe blog. Make sure to take a look at the gorgeous invitations these talented ladies have created for past brides!