Please! I need some advice!

This is my brothers wedding and the time will be around 4:00PM. At first it was going to be a beach wedding but they change it to the church (-_-), but they keep the colors and the beach theme. It will be very casual too. My problem is that I was really into a coral and/or teal dress but this week my SIL told me that the wedding colors are peach and ultramarine blue, basically the same thing. I want to avoid the colors of the wedding. What would you do in my case??

I want to use nude pumps but I'm not sure what colors will look nice. I want something cute and simple but with contrasting colors. I'll appreciate any suggestion... if you can include a pic it will be nice too!