Preheat oven to 400°F. Butter 12 (2-1/2-inch) muffin cups.
Combine flours, wheat germ, sugar, coconut, baking soda and salt in large bowl. Blend sour cream, eggs and oranges in small bowl; stir into flour mixture just until moistened. Fold in nuts. Spoon into prepared muffin cups, filling 3/4 full.
Bake 18 to 20 minutes or until wooden pick inserted in center comes out clean. Remove from pan. Cool on wire rack.