Accent don't overwhelm...
When using blue in your big event, we see designers do it in many ways. The most important part of using blue is to accent with it, don't overwhelm. Very few flowers come in royal blue or turquoise, accent it with your lighting or glassware, or small accessories like in your place settings or linens.
Bridal party attire
Put your girls in your shade of blue, and keep the flowers neutral!
Or pop some color...
There's many ways to accent your blue in your invitations, menu or place cards, party favors, cake accents, even shoes for your something blue!
If you are set on using blue in your flowers, keep it simple, and tasteful!