Hanky Panky Thongs ($31)
BHLDN Piccadilly Pumps ($320)
Sew a blue patch somewhere on your dress -- perhaps fabric from your father's or grandfather's shirt.
Blue fingernails may be a bit much, especially for a traditional wedding, but blue toenails are subtle and will transition well to your honeymoon. Essie Nail Polish ($8)
Wrap a blue, or blue-embroidered, handkerchief around your bouquet. Bonus points for sentimental value, such as if it belonged to your mom or grandmother.
If you don't want a blue shoe, consider blue soles on your shoes.
BHLDN Snowmelt Earrings ($160)