Fresh colors, light blues and greens, evoke a relaxing sense of calm.  Like the colors of water, these lovely colors give the sense of renewal and rebirth.  These cool colors can be integrated into any style of decor.  Balancing these lighter colors with darker neutrals will keep the space from looking bland.  In addition to color, a cool, fresh interior concept can be conveyed in other ways.  The use of  translucent materials such as glass or other reflective surfaces are a great way to give the sense of water.