One of my favorite color combinations happens to be blue and grey (last seen here), it's colorful yet subtle enough to wear day and night. I might even go as far compare it's contrast to white and black...

I'm especially loving this dress paired with this chic scarf belt. And as it turns out I guess, I do need a grey bag in my life, I was second guessing my purchase until this outfit came about ;).
 Dress Tucker for Target, Shoes Bakers, Bag Target, Scarf & Necklace Vintage, Sunglasses Old Navy, Bangles Vintage