New Color Combo: Charcoal & Emerald

I'm going to be a bridesmaid in a September wedding in which one of the wedding colors is charcoal. While the bride is doing a lovely combination of charcoal against soft pastels, I also love when this dark neutral is expressed with bright pops of color, such as canary yellow, featured in the image below.

However, lately I prefer unexpected color combinations. So I came up with an emerald green and charcoal palette, offset by the cool crispness of white.

What are your favorite unexpected color combinations for a wedding?