To provide year around interest the use of Evergreen & Broadleaf Evergreens is becoming more & more popular.
Evergreen trees & shrubs are usually ones with needles or conifers such as spruce, pines, junipers, cedars, yews false cypress.
Broadleaf evergreens are trees & shrubs that have leaves that stay on the plant all winter and most of them flower. Some more familiar ones are Rhododendrons, Holly(Ilex), Mountain Laurel(Kalmia), Lily of the valley bush(Pieris Japonica), Boxwood(Buxus), Barberry(Berberis), Euonymus and many more.
This last group is getting more popular as gardeners are asking more & more from their plants. This group has foliage & usually flowers spring and summer & also foliage throughout the winter, which often turns a different color for the winter creating a new display. Conifers also change to a winter color.
When you get these groups ready for winter the first two or three years they are planted they will establish more easily if they have winter protection from the wind. Wrap with burlap.