I wore mine with some dark purple Gucci suede boots I got from DSW last year. I also added a "real" Missoni scarf that had similar blue hues w/ a bit of purple just for modesty at the office. I think you can pull in any jewel tone colors and it will look great. Black is always the standard as that navy is so dark on the maxi dress - it looks black.
Thanks, azureartist! I was thinking purple would be good color. I need to start looking for a pair now so I'm ready when the weather warms up.