Bring 4 1/4 cups water to a boil in a saucepan; add wild rice. Reduce heat, and simmer 15 minutes. Stir in brown rice; cover and simmer 30 minutes or until water is absorbed. Stir in pecans and next 5 ingredients. Toss with vinaigrette. Transfer to a bowl; cover and chill 2 hours. Garnish, if desired.
*2 (6-ounce) packages long-grain and wild rice mix may be sustituted for wild and brown rice. Omit 4 1/4 cups water; prepare mix according to package direction