Maroon and yellow color palette is classic and chic which is a fabulous wedding color for a outdoor winter wedding.The bride in white gown with maroon shawl and holding the bouquet with yellow and maroon flowers, choose maroon shoes as the wedding shoes and make a garland with yellow and maroon flowers for your bride, decorate the table centerpieces with maroon and yellow fruits ect. Hope these ideas can give you some outdoor winter inspirations.