i like these for maxi dresses if you want a flat sandle that is a little dressier than a flip-flop...
http://www.shopbop.com/dolce-ankle-...htm?folderID=2534374302097693&fm=browse-brand
http://www.shopbop.com/dolce-ankle-...htm?folderID=2534374302097693&fm=browse-brand