Consider adding plants that produce berries to your site. In this area there are a sizable number of berry producing plants. For winter color I like to focus on those that produce berries that are brightly colored and not hidden among leaves. Evergreens help provide a nice bit of green, but their leaves hide the berries. Thus use them for the green and use deciduous plants for the show. Use both for wildlife activity though!
Each season has its own attraction and can be a joy to experience. Even winter when everything seems to be dead and dormant can have color and beauty. Berry producing plants work well to provide that color and to provide the excitement that attracting wildlife brings to your site.