One of the time-honored color combinations: blue and white. For specific paint color ideas, see Palette & Paints: Pale Blues.
Above two photos: An interior on the Swedish archipelago, via Skona Hem.
Above: A kitchen by Tom Sheerer on the Bahamas.
Above: A bath suite in LA by Aqua Vitae Design.
Above: A collection of blue and white plates, via Living Etc.
Above: A bath by New York firm Murphy Burnham & Buttrick.
Above: A bedroom spotted on Emma's Designblogg.
Above: A room at the Anemi Hotel on the island of Folegandros in the Cyclades, designed by Stavros Papagiannis.
Above: A couch draped in hand-blocked fabrics and pillows from Les Indiennes.
Above: A room from the Toast catalog.
Above: A bedroom in Sweden from the portfolio of Alun Callender.
Above: Designer Tom Scheerer's own kitchen on the Bahamas.
Above: Stairs painted blue in a London house.