Rope Belt!! Or alternately a Canvas belt. Either way you'll need a more casual look to with your shorts or chino's. The Rope belt has made it's comeback last season but like everything else, the play with color is big this year especially with the canvas belts. So if you don' have one yet, have some fun and get yourself one with a little color!
The Beige color is a safe bet and blends well with most color combinations.
The Navy Blue works well with light color clothing combinations.