If you tell some bridesmaids that yellow and blue are your wedding colors, they might say, "If you think we're wearing yellow dresses, you're crazy!" Really, though, yellow and blue are an ideal combination, especially in the summer sun.
Here, it's really important to think about the way you combine colors, and using one color as the main shade for your wedding, with an accent color complementing it, can change your wedding from "blah" to "wow."
The yellow/blue combo is one of these "wow" combos. Blue dresses with yellow accents or flowers really make the blue pop. Yellow roses with blue ribbons along the aisle will complement the attire. This one's pretty interchangeable -- just take into account your bridesmaids. Not everyone looks good in yellow, and if your bridesmaids won't, don't force them to buy a yellow dress.